PCOS and Fertility: How to Get Pregnant with Polycystic Ovary Syndrome

Polycystic ovary syndrome (PCOS) is the most common endocrine disorder affecting women of reproductive age, estimated to affect between 8–13% of women globally — and in Australia, approximately one in eight women of childbearing age. It is also the leading cause of anovulatory infertility — infertility caused by irregular or absent ovulation. Despite being so common, PCOS is frequently misunderstood, both by those who are diagnosed with it and sometimes by clinicians. For women who want to get pregnant, understanding PCOS, its effects on fertility, and the evidence-based options available to address it is essential. The good news: the vast majority of women with PCOS can achieve pregnancy with appropriate support.

What Is PCOS and How Is It Diagnosed?

PCOS is a hormonal syndrome characterised by a combination of features, though it manifests quite differently from woman to woman. The most widely accepted diagnostic criteria are the Rotterdam criteria, which require at least two of the following three features:

• Oligo-ovulation or anovulation (irregular or absent ovulation, often manifesting as irregular periods — cycles longer than 35 days or fewer than 8 periods per year)
• Clinical or biochemical signs of hyperandrogenism (elevated androgens such as testosterone or DHEAS, or physical signs such as excess facial or body hair — hirsutism — acne, or male-pattern hair thinning)
• Polycystic ovarian morphology on ultrasound (at least 20 follicles per ovary measuring 2–9 mm, or increased ovarian volume above 10 ml on ultrasound)

Importantly, the name is somewhat misleading. The "cysts" on the ovaries are not true cysts — they are immature follicles, each containing an egg that has begun to develop but stopped before reaching maturity. This arrest in follicle development means that ovulation either does not occur or occurs infrequently, which is why conception can be difficult.

PCOS is also associated with insulin resistance in approximately 65–70% of women with the condition. Excess insulin stimulates the ovaries to produce more androgens, which further disrupts ovulation. This insulin-androgen connection is central to many of the most effective PCOS treatments.

Blood tests used in diagnosis typically include LH, FSH, testosterone, DHEAS, SHBG, fasting glucose and insulin (to calculate HOMA-IR), prolactin, and thyroid function. Other conditions that can mimic PCOS — including hypothyroidism, congenital adrenal hyperplasia, and hyperprolactinaemia — should be excluded before a definitive diagnosis is made.

How PCOS Affects Fertility

The primary way PCOS impairs fertility is through disruption of the ovulatory cycle. Ovulation is necessary for natural conception — an egg must be released from the ovary and available for fertilisation. In women with PCOS, the hormonal milieu is frequently disrupted: elevated LH relative to FSH, elevated androgens, and insulin resistance collectively interfere with the normal follicular development and ovulation trigger.

Women with PCOS who do ovulate may ovulate less predictably, making timing of intercourse more difficult. Standard ovulation prediction kits (which detect the LH surge) can also be less reliable in women with PCOS, as many women with the condition have chronically elevated LH levels — meaning the kit may read positive at times other than actual ovulation, or the true ovulatory LH surge may be missed in the noise of baseline elevations.

Beyond ovulation, PCOS is associated with slightly higher rates of early pregnancy loss, partly due to the hormonal environment and partly due to associated insulin resistance and elevated androgens during early implantation. Once pregnant, women with PCOS have higher rates of gestational diabetes, pregnancy-induced hypertension, and preterm birth compared to women without PCOS — making antenatal monitoring important.

Despite these challenges, it is critical to emphasise that PCOS does not mean a woman cannot get pregnant. The ovarian reserve (egg supply) in most women with PCOS is actually higher than average — there are more follicles available, even if they are not maturing normally. This is reflected in typically higher AMH (anti-Müllerian hormone) levels in women with PCOS. The challenge is not egg quantity but the process of getting them to ovulate.

Lifestyle Changes: The Most Underestimated Treatment

For women with PCOS who are overweight, weight loss is consistently identified in guidelines as the most effective first-line intervention for improving fertility. Even a 5–10% reduction in body weight can restore ovulation in many women and significantly improve response to fertility medications. A 2016 Cochrane review found that lifestyle interventions significantly improved reproductive outcomes in overweight or obese women with PCOS, including higher ovulation rates, lower androgen levels, and improved menstrual regularity.

The mechanism is primarily through improvement in insulin sensitivity. As insulin resistance decreases, ovarian androgen production falls, the LH:FSH ratio normalises, and follicular development can progress more normally. This is why interventions targeting insulin — whether through weight loss, dietary change, exercise, or medication — are so central to PCOS management.

Diet for PCOS should focus on: reducing refined carbohydrates and high-glycaemic foods (which cause insulin spikes); increasing fibre intake from vegetables, legumes, and whole grains; adequate protein to support satiety and muscle mass; and healthy fats, particularly omega-3s from oily fish, which have anti-inflammatory and insulin-sensitising properties. The Mediterranean and low-GI dietary patterns have both shown benefit in PCOS research.

Exercise improves insulin sensitivity independently of weight loss. Both aerobic exercise (such as brisk walking, swimming, cycling) and resistance training are beneficial. Current guidelines recommend at least 150 minutes of moderate-intensity exercise per week for women with PCOS.

For women of healthy weight, the same dietary and exercise principles apply in terms of optimising insulin sensitivity and reducing androgen excess — though the impact on weight loss is less relevant. Stress management and adequate sleep are also important, as cortisol can worsen insulin resistance.

Medical Treatments for PCOS-Related Infertility

When lifestyle changes alone are insufficient to restore ovulation, or when a couple wishes to proceed more quickly, medical ovulation induction is the next step. Several evidence-based options are available:

Letrozole (an aromatase inhibitor) is now the first-line medical treatment for ovulation induction in women with PCOS, based on evidence from the landmark NEJM study (Legro et al., 2014) showing higher live birth rates than clomiphene. Letrozole temporarily suppresses oestrogen production, which triggers a natural FSH rise and stimulates follicle development. It is taken for 5 days early in the cycle (typically days 2–6) and is associated with lower rates of multiple pregnancy than other treatments.

Clomiphene citrate (Clomid) was previously the standard first-line treatment and remains widely used. It works by blocking oestrogen receptors in the hypothalamus, again leading to a rise in FSH and follicle stimulation. It is effective in approximately 70–80% of women with PCOS for inducing ovulation, but live birth rates per cycle are somewhat lower than with letrozole. Side effects include hot flushes, mood changes, and — importantly — thickening of the cervical mucus, which can actually impair sperm passage.

Metformin is an insulin-sensitising medication (used for type 2 diabetes) that addresses insulin resistance in PCOS. When used alone for ovulation induction, it is less effective than letrozole or clomiphene, but it may enhance their effectiveness when used in combination. Metformin also reduces the risk of OHSS (ovarian hyperstimulation syndrome) in IVF. It is often continued into early pregnancy to reduce miscarriage risk, though evidence on this is still evolving.

Gonadotrophins (injectable FSH ± LH) can be used for ovulation induction when oral agents fail, but require careful monitoring to avoid multiple follicle development and OHSS. They are more commonly used in IUI or IVF protocols for women with PCOS.

Laparoscopic ovarian drilling (LOD) is a surgical procedure in which small holes are made in the ovarian surface using electrocautery or laser. This destroys a portion of the androgen-producing stroma, reducing androgens and LH, and often restoring regular ovulation for a period of months to years. It is generally reserved for women who have not responded to medication or who require laparoscopy for another reason. It avoids the risk of multiple pregnancy associated with ovulation induction medications.

PCOS and IVF: What to Expect

For women with PCOS who proceed to IVF — either because ovulation induction has been unsuccessful or other fertility factors are also present — PCOS has specific implications for the IVF process. On the one hand, the high antral follicle count (AFC) and AMH typical of PCOS mean that ovaries often respond very vigorously to stimulation, potentially yielding a large number of eggs. On the other hand, this same hyperresponsiveness creates a significant risk of ovarian hyperstimulation syndrome (OHSS) — a potentially serious complication in which the ovaries become swollen and fluid accumulates in the abdomen.

Modern IVF protocols for women with PCOS have evolved to minimise OHSS risk. The antagonist protocol (using a GnRH antagonist to prevent premature ovulation) is preferred over the traditional long-protocol because it allows use of a GnRH agonist trigger rather than an hCG trigger — dramatically reducing OHSS risk. A "freeze-all" strategy — in which all embryos are frozen rather than transferred fresh, allowing the ovaries to recover completely before a subsequent frozen embryo transfer — is widely adopted for PCOS patients and associated with improved pregnancy rates and minimised OHSS risk.

Metformin pre-treatment and continued use during stimulation reduces OHSS incidence in PCOS patients. Cabergoline is also sometimes used to prevent severe OHSS. Inositol supplementation (particularly myo-inositol) has emerging evidence supporting its use before and during IVF in women with PCOS, with studies suggesting improved oocyte and embryo quality and reduced OHSS risk.

Supplements and Natural Support for PCOS Fertility

Several nutritional supplements have evidence supporting their use in women with PCOS who are trying to conceive.

Myo-inositol is the supplement with the strongest evidence base for PCOS. Inositol is a naturally occurring sugar alcohol that plays a role in insulin signalling. Women with PCOS have been shown to have imbalanced inositol metabolism, with a higher than normal ratio of D-chiro-inositol to myo-inositol in the ovarian follicle fluid. Supplementation with myo-inositol (typically 4 g/day alone or in combination with D-chiro-inositol at a ratio of 40:1) has been shown in multiple RCTs to improve insulin sensitivity, restore menstrual regularity, improve oocyte quality, and increase ovulation rates.

Folate / methylfolate: All women trying to conceive should take folate (or methylfolate, the active form, which is better absorbed in women with MTHFR gene variants). Folate reduces the risk of neural tube defects and supports healthy cell division. The recommended dose in Australia is 500 mcg daily, beginning at least one month before conception.

Vitamin D: Deficiency is common in PCOS and associated with worse insulin resistance and lower fertility. Correcting vitamin D deficiency through supplementation (typically 1000–2000 IU daily, or higher if severely deficient) can improve insulin sensitivity, menstrual regularity, and ovarian function.

N-acetyl cysteine (NAC) is an antioxidant with insulin-sensitising properties. Several small studies have found NAC comparable to metformin in improving insulin sensitivity, ovulation rates, and pregnancy rates in women with PCOS.

Berberine is a plant-derived compound with strong insulin-sensitising properties. A 2012 study published in Fertility and Sterility found berberine to be as effective as metformin in reducing androgens and improving insulin resistance in women with PCOS.

Omega-3 fatty acids: Several trials have shown that omega-3 supplementation reduces triglycerides, LDL cholesterol, and inflammatory markers in PCOS, and may improve insulin sensitivity and reduce testosterone levels.

Success Rates and Positive Outcomes

One of the most important messages for women with PCOS who want to get pregnant is this: the vast majority do conceive, and many do so naturally or with relatively simple interventions. Studies suggest that over 80% of women with PCOS who are treated for anovulatory infertility (whether with lifestyle changes, oral ovulation induction, or ART) achieve a successful pregnancy. The path may take longer and require more medical support than for women without PCOS, but PCOS alone is not a barrier to motherhood.

Cumulative live birth rates through IVF in women with PCOS are comparable to or better than those in women with other causes of infertility, largely because egg supply is not the limiting factor — it is the process of egg maturation and release. With the right protocol and careful management, IVF can be highly effective for women with PCOS.

Frequently Asked Questions About PCOS and Fertility

If I have PCOS and irregular periods, does that mean I never ovulate?
Not necessarily. Irregular periods in PCOS mean that ovulation occurs infrequently or unpredictably — not that it never occurs. Some women with PCOS ovulate regularly; others ovulate occasionally (oligovulation); and some do not ovulate at all (anovulation). The key is to determine whether and when ovulation is occurring in your specific case. Basal body temperature charting, ovulation predictor kits (with awareness of their limitations in PCOS), and blood progesterone levels in the second half of the cycle can help identify whether ovulation is occurring. Monitoring with transvaginal ultrasound — used in fertility clinics during ovulation induction cycles — is the most reliable way to confirm follicle development and ovulation.

Can I get pregnant naturally with PCOS without medication?
Many women with PCOS conceive naturally, particularly if they ovulate regularly or irregularly. For women who are overweight, weight loss through diet and exercise alone can restore regular ovulation and lead to natural conception. For lean women with PCOS, dietary improvements, stress reduction, and supplements like myo-inositol may support ovulatory function. However, if you have been trying for 12 months without success (6 months if over 35), or if your periods are very irregular (more than 6 weeks apart), it is advisable to see a fertility specialist for assessment rather than continuing to try without guidance. Time matters, and effective ovulation induction treatments are available that can significantly shorten the path to pregnancy.

Does PCOS go away after pregnancy?
PCOS is a lifelong syndrome that does not resolve with pregnancy. However, pregnancy itself can temporarily normalise some hormonal parameters. After childbirth, PCOS typically returns to its pre-pregnancy state. Many women find that symptoms, including cycle regularity and fertility, are actually similar in subsequent pregnancies — if they could conceive once with support, the same approach tends to work again. Some women notice improvements in symptoms during breastfeeding (due to hormonal changes), but this is temporary. Long-term management of PCOS — including healthy weight maintenance, diet, exercise, and monitoring for metabolic health — remains important throughout a woman's life.

Is myo-inositol safe to take during pregnancy?
Myo-inositol appears to be safe in pregnancy based on current evidence. Several studies have explored its use during pregnancy in women with gestational diabetes risk, and it has not been associated with adverse outcomes. However, it is not yet a standard recommendation during pregnancy (unlike folate), and most evidence is from pre-conception use. If you are taking myo-inositol when you conceive, it is reasonable to discuss continuing it with your obstetrician or midwife, particularly if you have insulin resistance. Do not stop folate supplementation in favour of inositol — both can be taken together.

How many follicles is too many during ovulation induction monitoring?
This depends on the treatment being used. During oral ovulation induction with letrozole or clomiphene, the goal is development of one or two dominant follicles. If three or more follicles of ≥14 mm are developing, the treating clinician will usually advise withholding the ovulatory trigger injection to avoid the risk of high-order multiple pregnancy. During gonadotrophin stimulation, similar caution applies. In IVF, developing many follicles is expected — the risk of OHSS is managed through protocol adjustments, trigger choice, and freeze-all strategies rather than cycle cancellation.

Does metformin help with PCOS fertility?
Metformin is an insulin-sensitising medication that can improve metabolic and hormonal parameters in PCOS. It improves insulin sensitivity, reduces androgen production, and can help restore regular ovulation in some women. However, as a standalone ovulation induction agent, it is less effective than letrozole or clomiphene. It is most useful as an adjunct — improving the response to other treatments and reducing OHSS risk in IVF. Metformin is generally well-tolerated, with gastrointestinal side effects (nausea, diarrhoea) being the most common complaint, particularly in the initial weeks of use. These can be minimised by starting at a low dose and taking it with food.

What is the difference between PCOS and just having polycystic ovaries?
This is an important distinction that is frequently confused. Polycystic ovarian morphology on ultrasound (multiple small follicles in the ovaries) is present in approximately 20–30% of women of reproductive age, including many who are perfectly fertile and have no hormonal abnormalities. Having polycystic-looking ovaries on ultrasound alone does not constitute a diagnosis of PCOS — the syndrome requires additional features (irregular periods and/or signs of elevated androgens). Conversely, some women with PCOS do not have polycystic-appearing ovaries on ultrasound (particularly those with elevated androgens and irregular cycles but normal AFC). This is why PCOS is a clinical diagnosis based on meeting Rotterdam criteria, not a purely ultrasound-based one.

Can I use ovulation predictor kits if I have PCOS?
You can use them, but interpret results with caution. Standard LH-surge-detecting OPKs can be unreliable in PCOS because many women with the condition have chronically elevated baseline LH levels, which can produce false-positive results throughout the cycle — not just at ovulation. This may lead to confusion about when (or whether) ovulation is actually occurring. Advanced OPKs that measure both oestrogen and LH (such as Clearblue Advanced Digital) may be more reliable for PCOS as they look for the peak ratio rather than absolute LH threshold. Cycle monitoring with ultrasound through a fertility clinic remains the most accurate way to track follicle development and confirm ovulation.

Is OHSS (ovarian hyperstimulation syndrome) dangerous?
OHSS can range from mild to severe. Mild OHSS (abdominal bloating, mild discomfort, nausea) is common after IVF stimulation in women with PCOS and usually resolves within 1–2 weeks. Moderate OHSS involves more significant abdominal distension and fluid accumulation and may require hospitalisation for monitoring and symptom management. Severe OHSS — involving significant fluid accumulation, severe abdominal pain, breathing difficulties, blood clots, and kidney impairment — is rare but potentially life-threatening. Modern IVF protocols using GnRH antagonist cycles with agonist trigger and freeze-all strategies have dramatically reduced the incidence of severe OHSS in high-risk patients. If you have PCOS and are proceeding to IVF, discuss OHSS prevention strategies with your clinic before starting stimulation.

What are my chances of getting pregnant with PCOS?
The prognosis is genuinely positive. With appropriate treatment, the vast majority of women with PCOS who wish to conceive do so. Studies suggest that cumulative pregnancy rates of 70–80% can be achieved within 12 months of starting ovulation induction treatment. For those who proceed to IVF, cumulative live birth rates per complete treatment cycle (including all frozen embryo transfers) are comparable to or better than those seen in other diagnostic groups, because egg quantity is typically not a limiting factor. Age, male factor fertility, and other concurrent health conditions also influence outcomes. Seeking early evaluation and working with a specialist experienced in PCOS fertility management gives you the best chance of the most efficient and successful path to pregnancy.