Perimenopause and fertility: can you get pregnant and what are your options?

Perimenopause raises fertility questions that many women feel uncertain about, and sometimes afraid to ask. Whether you are hoping to conceive, trying to avoid pregnancy, or simply unsure where you stand, the honest answer to most of those questions is: more is possible than you might think, and less is certain than you might assume.

This article is written for all three groups. It covers what is happening to fertility during perimenopause, the actual probabilities, what testing does and does not tell you, your options if you want to conceive, and what the current UK guidance says about contraception.

Key takeaways

• Perimenopause is not menopause. Until 12 consecutive months without a period have passed, ovulation is still occurring, however unpredictably, and pregnancy is therefore still possible.
• Clinical data suggests around 30% of women aged 40 to 44 conceive naturally within a year. For women aged 45 to 49, the figure is approximately 10%. These are population averages, not individual predictions, but they are real.
• A low AMH result tells your specialist how your ovaries may respond to fertility medication. It does not mean natural conception is impossible. Many women with low AMH have conceived naturally.

First, a clarification: perimenopause is not menopause

This distinction matters practically and emotionally. Menopause is defined as 12 consecutive months without a menstrual period. Until that point has passed, a woman is in perimenopause: the transition phase that can last several years, during which hormones fluctuate, periods become irregular, and fertility changes but does not disappear.

Updated clinical guidance confirms that egg numbers decline steadily from around age 32, with an accelerated rate from age 37. But decline is not absence. Perimenopause is a time of changing fertility, not ended fertility, and understanding that distinction shapes everything else in this article.

Can you still ovulate during perimenopause?

Yes, though increasingly unpredictably.

During perimenopause, rising FSH (follicle-stimulating hormone) levels stimulate follicle development, and ovulation continues. What changes is the regularity and reliability of ovulation, and the quality of the eggs released.

The data is striking: evidence of luteal phase activity (indicating ovulation) has been found in 87.9% of cycles up to five years before the final menstrual period, and still in 22.8% of cycles within one year of the final period. Even as the transition approaches its end, ovulation is still occurring in roughly one in four cycles.

One detail worth noting: some women ovulate more than once in a cycle during perimenopause, as the hormonal regulatory system becomes less stable. This is clinically unusual but documented, and it further complicates the idea that irregular periods mean no conception risk.

What are the actual chances of getting pregnant during perimenopause?

Clinical data cited in Contraceptive Technology (2023) suggests that around 30% of women aged 40 to 44 conceive naturally within a year. For women aged 45 to 49, this falls to approximately 10% per year. After 50, spontaneous pregnancy is rare but documented.

A woman's actual probability depends on her individual ovarian reserve, the frequency of ovulation in her cycles, egg quality, her partner's fertility (where relevant), and other health factors. These factors matter for women who want to conceive and are wondering whether it is still possible, and for women who are not trying and need to understand why contraception remains necessary.

How perimenopause affects egg quality and ovarian reserve

Two processes run in parallel during the perimenopausal transition.

The first is declining ovarian reserve. The second is declining egg quality. As eggs age, chromosomal abnormalities become more common, which is why miscarriage rates rise significantly with maternal age, and why chromosomal conditions become more common in pregnancies conceived at advanced maternal age.

Two tests are used to assess ovarian reserve: a blood test checking AMH (anti-Mullerian hormone) and an ultrasound measurement of small resting follicles. Both are genuinely useful but they have their limitations. The American Society for Reproductive Medicine's committee opinion on ovarian reserve testing states that these tests can help predict how the ovaries may respond to fertility medications, but they cannot tell you how likely you are to become pregnant naturally. A low AMH result tells the specialist how your ovaries are likely to respond if you pursue IVF but it does not mean that natural conception is impossible.

Many women with low AMH have conceived naturally. If you have received a low AMH result and feel it closes the door, it is worth having a conversation with a specialist who will interpret it in the context of your full history and not as a standalone value.

Am I pregnant or perimenopausal?

Both can present identically in the early stages: missed or irregular periods, fatigue, breast tenderness, mood changes, nausea, and changes in libido. In perimenopause, all of these are directly driven by hormonal fluctuation. In early pregnancy, they are driven by rising hCG (Human chorionic gonadotropin).

The overlap is significant enough that early pregnancy is genuinely easy to miss during perimenopause, particularly when irregular periods have already established a pattern of unpredictability.

The answer to "am I pregnant or perimenopausal?" is simple, important, and often delayed: take a pregnancy test. A urine pregnancy test reliably detects hCG from around the time of a missed period. If the result is unclear or you want confirmation, a blood test from your GP can detect pregnancy earlier and more precisely.

If you are in perimenopause and your contraception is not reliable, or there is any possibility of conception, do not wait for symptoms to resolve to find out. The test will tell you, quickly and definitively.

If you want to conceive: your options during perimenopause

The options available to you depend significantly on where you are in perimenopause and your individual fertility picture. A specialist assessment is the right starting point: it will tell you what is realistic and which routes are most likely to be effective for your specific situation.

Natural conception

Still possible, particularly in early perimenopause. Clinical data suggests meaningful annual conception rates into the mid-40s. If you have been trying for six months without success and are over 40, specialist referral is appropriate rather than waiting the full 12 months recommended for younger women.

IVF with your own eggs

UK regulatory data from the Human Fertilisation and Embryology Authority (HFEA) shows a pregnancy rate of 16% per embryo transferred for women aged 40 to 42 using their own eggs, falling to 9% for women aged 43 to 44. These figures reflect what is achievable with current UK clinical practice and are worth understanding clearly before making decisions.

IVF with donor eggs

Donor egg IVF uses eggs from a younger donor, which significantly changes the success rate. HFEA data shows live birth rates of above 30% across all age groups using donor eggs, regardless of the recipient's age. A 2025 study published in Population Studies, drawing on HFEA data from all UK licensed clinics, found that donor egg procedures now account for half of all procedures among women aged 45 to 50 in the UK. This is not an edge case or a last resort; it is the mainstream treatment pathway for this age group.

Choosing to use donor eggs is a significant personal decision that involves important emotional and ethical considerations. A specialist can help you understand what it involves and whether it is right for you.

IUI (intrauterine insemination)

A less intensive procedure than IVF, placing sperm directly into the uterus. Success rates are lower than IVF and decline significantly with age. It may be appropriate in specific clinical circumstances, which a specialist can assess.

Egg freezing

Freezing your own eggs for future use may be relevant for some women in early perimenopause who are not yet ready to conceive. Success rates depend significantly on age at the time of freezing. Eggs frozen in the mid-to-late 40s have substantially lower success rates than those frozen in the 30s. A realistic, individually assessed picture from a specialist is essential before deciding whether this is a viable option.

Voy does not provide fertility treatment. If fertility treatment is the right next step for you, a 45-minute BMS-trained specialist consultation can clarify your full hormonal picture and refer you to an appropriate reproductive specialist.

Pregnancy risks during perimenopause: what the evidence shows

These are real risks that deserve honest communication, not concealment.

Miscarriage

Miscarriage risk rises significantly with age. Research in obstetrics and gynaecology confirms that advanced maternal age (over 35) is a strong independent risk factor for first-trimester miscarriage, primarily due to chromosomal abnormalities in the egg. By the mid-40s, miscarriage rates in recognised pregnancies are substantially higher than in younger women.

Chromosomal conditions

The increased risk of chromosomal conditions, including Down syndrome, rises with maternal age. Non-invasive prenatal testing is now routinely offered to women over 35 in the UK, providing detailed chromosomal information earlier in pregnancy to support informed decision-making.

Gestational diabetes, pre-eclampsia, and preterm birth

All of these are more common with advanced maternal age but treatable with specialist antenatal care. Pre-eclampsia risk is approximately 1.5 to 2.0 times higher in women over 40 than in younger women. With appropriate monitoring and care, positive neonatal outcomes are achievable.

Tracking ovulation during perimenopause: what works and what does not

Standard cycle-day tracking (counting from the first day of your period) becomes unreliable in perimenopause because cycle length becomes inconsistent. If cycles vary from 21 days to 45 days, day-14 ovulation timing is not a useful guide.

Ovulation predictor kits detect the LH surge that precedes ovulation. However, during perimenopause, FSH and LH levels can be elevated independent of ovulation, which some tests may register as a positive result even when ovulation has not occurred. This can produce misleading results in women with the hormone patterns typical of perimenopause.

Tracking basal body temperature can help confirm that ovulation has happened by detecting the small rise in temperature that occurs afterwards. However, it needs to be done consistently and carefully, and it can be difficult to interpret accurately. It also only confirms ovulation after it has occurred, rather than predicting when ovulation is about to happen.

“In summary: ovulation tracking is significantly harder in perimenopause than in regular cycles. If conception is your goal, specialist assessment is the most reliable route, both to confirm whether ovulation is occurring and to advise on the most appropriate monitoring approach for your situation.”

Katy Jackson, Clinical Director - Women's Health

If you are not trying to conceive: contraception during perimenopause

Irregular or infrequent periods do not mean infertility so contraception remains necessary until menopause is confirmed.

HRT does not provide contraception. HRT replaces hormones at much lower doses than contraceptives and does not reliably suppress ovulation even when on higher doses. If you are taking HRT and still cycling, then you need separate contraception.

The stopping rules from current UK guidance (Women's Health Concern / British Menopause Society, December 2025 and FSRH, amended May 2025):

• Under 50 at the time of your last natural period: continue contraception for two years after that period
• Over 50 at the time of your last natural period: continue contraception for one year after that period
• Age 55: contraception can be stopped regardless of bleeding pattern, as natural conception after this age is exceptionally rare

"Natural period" means an unmedicated bleed. Withdrawal bleeds from hormonal contraception do not count.

For women who are on HRT and require contraception, the 52mg LNG-IUS (Mirena coil) provides both contraception and the progestogen component of HRT simultaneously. For more on contraceptive options during perimenopause, see our dedicated article.

If you are taking HRT and think you may have become pregnant, it is important to stop your HRT and speak to your doctor or menopause specialist as soon as possible. Although HRT is not a contraceptive and pregnancy can still occur during perimenopause, HRT is not recommended during pregnancy. Your healthcare professional can provide appropriate advice and support based on your individual circumstances.

Getting the support that matches where you are

If you are trying to conceive, one of our specialists can assess your full hormonal picture, interpret what that means in your individual context, and refer you to an appropriate fertility specialist if that is the right next step.

If you require contraception alongside HRT, one of our specialists can advise you on the full spectrum of options. Please note that Voy does not provide a coil fitting service.

If you are uncertain about your status, Voy's Women's Midlife MOT Blood Test measures 16 biomarkers including FSH, oestradiol, and SHBG for women aged 40 and over, providing a clearer hormonal picture that informs what is happening and what comes next.

93% of Voy members reported improvement in overall quality of life after starting comprehensive menopause treatment (presented at The Menopause Society 2025, forthcoming in Climacteric). Getting clarity on your hormonal picture is where that journey starts.