Guide · updated 16 May 2026

PCOS / PMOS and fertility: what you need to know, without the drama

PCOS is the leading cause of anovulation worldwide according to the WHO. But anovulation does not mean permanent infertility — not by a long way. The NIH / NICHD notes that around 50% of women with PCOS experience difficulties conceiving — which means the other half conceive without specific medical intervention.

Information, not a diagnosis. This page provides general guidance. It does not constitute a diagnosis and does not replace a personalised medical consultation.

Why can fertility be affected?

In PCOS / PMOS, fertility is primarily affected by anovulation — the absence of ovulation, or ovulation too infrequent to allow regular conception. This mechanism is driven by several hormonal disruptions that reinforce one another.

Excess LH (luteinising hormone) relative to FSH disrupts follicular maturation. Insulin resistance, common in PCOS, stimulates androgen production by the ovaries and adrenal glands, which further compounds the imbalance. The result: follicles begin to develop but fail to reach full maturation, and the egg is not released.

This mechanism is not irreversible. It often responds to appropriate medical management, and sometimes to lifestyle changes alone.

Irregular cycles: am I still ovulating?

Not necessarily, but it is possible. Irregular cycles do not mean a total absence of ovulation: some women with PCOS do ovulate, but unpredictably. Others have cycles that appear normal on the surface but without effective ovulation (anovulatory cycles).

To assess ovulation without immediately resorting to specialist tests, several approaches exist: measuring basal body temperature every morning on waking (a rise of 0.2–0.3°C generally indicates ovulation), using urine ovulation test kits (which detect the LH surge), or a mid-luteal progesterone blood test. These tools give pointers, but ultrasound monitoring by a midwife or gynaecologist remains the most reliable method to confirm ovulation.

When to see a doctor about fertility?

General recommendations for all couples are to consult after 12 months of trying without pregnancy if under 35, and 6 months if over 35. With known PCOS, an earlier consultation is reasonable, especially if:

your cycles are very irregular (over 40–45 days) or absent;
you are over 35 from the start of trying;
you have medical history that may affect fertility;
your partner has never had a fertility assessment.

An early consultation is not an admission of urgency: it is an informed approach. It allows you to get a baseline assessment, understand your ovulatory profile and, if necessary, anticipate medical options.

What medical options may be discussed?

Several medical options exist to support ovulation in PCOS. They are discussed with your doctor based on your profile, age, hormone workup, and preferences. This guide presents them for information, without recommending one over another.

Letrozole: an aromatase inhibitor, recommended as first-line treatment for ovulation induction in PCOS according to the Monash 2023 guideline . Higher pregnancy rate per cycle than clomiphene.
Clomiphene citrate: formerly the first-line option, still used. Established efficacy, possible side effects (hot flushes, transient functional cysts).
Gonadotrophins: hormone injections to directly stimulate the ovaries. Used if oral treatments are ineffective; require close ultrasound monitoring.
IVF (in vitro fertilisation): as a last resort when other options have not worked, or from the outset depending on context (age, additional cause).

The ACOG Practice Bulletin on PCOS provides a clinical overview of medical options for both professionals and patients.

Lifestyle and fertility

In patients with overweight, a 5–10% reduction in body weight can improve cycle regularity and response to medical treatments — this is documented by the Monash 2023 guideline. But this approach is neither universal nor mandatory. Patients with normal weight have the same medical options, and many women with overweight conceive without prior weight loss.

Regular moderate physical activity (walking, swimming, yoga) helps improve insulin sensitivity and can support cycle regularity. Sleep also plays a role that is often underestimated: poor quality sleep worsens insulin resistance. Finally, stress management, while not a solution in itself, can indirectly support hormonal balance.

These are levers among others — not requirements. Every woman's body responds differently, and an individualised approach with a healthcare professional remains the best path.

Risks to monitor during pregnancy

Pregnancies with PCOS / PMOS are usually straightforward. However, the risk of certain complications is statistically higher: gestational diabetes, gestational hypertension, and pre-eclampsia. These risks are not inevitable, but they justify appropriate monitoring, including:

gestational diabetes screening between 24 and 28 weeks of gestation;
regular blood pressure monitoring;
careful fetal growth monitoring if other risk factors are present.

Your doctor or midwife is best placed to adapt this monitoring to your individual situation.

The emotional side of trying to conceive

The waiting can be long, uncertain, and emotionally exhausting. It is important to acknowledge this without minimising it. Many women describe a feeling of isolation during this period, particularly when those around them do not fully understand the weight of each cycle that passes.

Resources exist: RESOLVE (National Infertility Association) in the US, Infertility Network UK, psychological support (fertility-specialist therapist, support groups), couples counselling. Not isolating yourself with this subject is perhaps the most cross-cutting piece of advice on this page.

What if I am not trying to conceive right now?

Fertility is not the only reason to address cycles in PCOS. Very long or absent cycles can lead to endometrial hyperplasia if the endometrium is not regularly shed. This is worth discussing with your doctor, regardless of any pregnancy plans. Regulatory options (hormonal contraception, cyclical progestogen) can protect the endometrium while taking your broader context into account.

Prepare my fertility appointment Questions to ask my doctor

Frequently asked questions

Does PCOS mean I am infertile?

No. PCOS / PMOS is the leading cause of anovulation worldwide, which can make conception take longer or require medical support. But many women with PCOS conceive spontaneously, and available medical treatments are effective in the vast majority of cases. It is not a sentence.

Do I need to lose weight before trying to conceive?

Not necessarily. In patients with overweight, a 5–10% reduction in body weight can improve cycle regularity and response to treatments. But this is one option among others, not a prerequisite. Patients with a normal weight have PCOS too and have access to the same medical options. Discuss this with your doctor, without guilt.

What is the first-line medical treatment for ovulation?

Letrozole (an aromatase inhibitor) is now recommended as first-line treatment for ovulation induction in PCOS, according to the 2023 international Monash guidelines. It is progressively replacing clomiphene citrate, which is still used. These decisions are made with your doctor, taking your individual profile into account.

Are there risks for the baby?

PCOS itself does not carry specific risks for the baby. However, pregnancy in a woman with PCOS is considered to warrant closer monitoring: higher risk of gestational diabetes, high blood pressure, and pre-eclampsia. Appropriate monitoring allows these risks to be anticipated and managed.

When should I see a doctor if I am trying to conceive?

If your cycles are very irregular or absent, it is reasonable to consult from the start of your attempts, without waiting several months. For women with roughly regular cycles: general recommendations are 12 months of trying before age 35, 6 months after age 35. With known PCOS, an early medical opinion is always useful.

Main sources

Page written from official public sources. It is not intended to diagnose or recommend a treatment. For any medical decision, consult a healthcare professional.