The short answer
Perimenopause is the transition leading up to menopause — often several years — when your hormones fluctuate and your periods become irregular. The key point for fertility is that ovulation hasn't stopped; it has just become erratic. As long as your ovaries occasionally release an egg, pregnancy is possible. Your fertility is lower than it once was and keeps falling with age, but it doesn't reach zero until you reach menopause itself: 12 consecutive months with no period. Until then, if you want to avoid pregnancy you still need contraception, and if you are hoping to conceive it is harder — but not impossible.
What perimenopause does to your fertility
What this means in practice
If you are hoping to conceive
It is harder but not impossible. Because fertility declines faster in this stage, speaking with a clinician sooner rather than later gives you the clearest view of your options.
If you want to avoid pregnancy
Keep using contraception. Guidelines generally advise continuing until menopause is confirmed — commonly 12 months with no period if you are over 50, or 24 months if under 50. A clinician can confirm when it is safe to stop.
Either way, know your numbers
Tracking your cycle and measuring your hormones tells you more than symptoms alone — whether your goal is avoiding pregnancy, planning for it, or simply understanding the transition.
If you want to avoid pregnancy
Keep using contraception. Guidelines generally advise continuing until menopause is confirmed — commonly 12 months with no period if you are over 50, or 24 months if under 50. A clinician can confirm when it is safe to stop.
If you are hoping to conceive
It is harder but not impossible. Because fertility declines faster in this stage, speaking with a clinician sooner rather than later gives you the clearest view of your options.
Either way, know your numbers
Tracking your cycle and measuring your hormones tells you more than symptoms alone — whether your goal is avoiding pregnancy, planning for it, or simply understanding the transition.
What the research shows
Peer-reviewed evidence on fertility and contraception through the perimenopause transition, and how reproductive aging is studied.
Contraception for midlife women: a review (Menopause, 2018)
Hormonal contraception in perimenopausal women (Best Pract Res Clin Obstet Gynaecol, 2025)
Age-Related Fertility Decline (StatPearls, 2026)
Ovarian aging in humans: potential strategies for extending reproductive lifespan (GeroScience, 2023)
Common questions about pregnancy in perimenopause
Yes. Perimenopause is the transition before menopause, when hormones fluctuate and periods become irregular — but your ovaries are still releasing eggs some of the time. As long as you are ovulating, even occasionally and unpredictably, pregnancy is possible. Fertility is lower than it was in your 20s and 30s, but it does not reach zero until you have reached menopause.
Natural fertility declines steadily with age, and the decline accelerates through the 40s as the number and quality of remaining eggs falls. So the monthly chance of conceiving is much lower than earlier in life — but "lower" is not "none." Because ovulation during perimenopause is irregular, it can also be hard to predict when you are fertile, which is exactly why unintended pregnancies still happen in this stage.
Not as soon as periods become irregular. Clinical guidelines generally advise continuing contraception until menopause is confirmed — commonly until you have had no period for 12 months if you are over 50, or for 24 months if you are under 50. Because those timelines are individual and can be affected by hormonal contraception or hormone therapy, the safest approach is to confirm with a licensed clinician before you stop.
No. Standard menopausal hormone therapy is not a contraceptive and should not be relied on to prevent pregnancy. It replaces hormones to ease symptoms; it does not reliably stop ovulation. If you are in perimenopause and do not want to become pregnant, you still need a dedicated form of contraception alongside any hormone therapy — your clinician can help you choose one.
Yes. Irregular, skipped or unusually spaced periods are a hallmark of perimenopause, and they often still include ovulation — just on an unpredictable schedule. A long gap between periods does not confirm that you have stopped ovulating. Menopause is only confirmed in hindsight, after 12 consecutive months with no period at all.
Perimenopause is the years-long transition when hormones are shifting but ovulation still happens intermittently — so natural pregnancy is still possible. Menopause is the single point 12 months after your final period; once you have reached it, natural conception is no longer expected. If you want to understand where you are in that transition, a hormone panel reviewed by a clinician can give you a clearer picture than symptoms alone.
Yes. Perimenopause is the transition before menopause, when hormones fluctuate and periods become irregular — but your ovaries are still releasing eggs some of the time. As long as you are ovulating, even occasionally and unpredictably, pregnancy is possible. Fertility is lower than it was in your 20s and 30s, but it does not reach zero until you have reached menopause.
Natural fertility declines steadily with age, and the decline accelerates through the 40s as the number and quality of remaining eggs falls. So the monthly chance of conceiving is much lower than earlier in life — but "lower" is not "none." Because ovulation during perimenopause is irregular, it can also be hard to predict when you are fertile, which is exactly why unintended pregnancies still happen in this stage.
Not as soon as periods become irregular. Clinical guidelines generally advise continuing contraception until menopause is confirmed — commonly until you have had no period for 12 months if you are over 50, or for 24 months if you are under 50. Because those timelines are individual and can be affected by hormonal contraception or hormone therapy, the safest approach is to confirm with a licensed clinician before you stop.
No. Standard menopausal hormone therapy is not a contraceptive and should not be relied on to prevent pregnancy. It replaces hormones to ease symptoms; it does not reliably stop ovulation. If you are in perimenopause and do not want to become pregnant, you still need a dedicated form of contraception alongside any hormone therapy — your clinician can help you choose one.
Yes. Irregular, skipped or unusually spaced periods are a hallmark of perimenopause, and they often still include ovulation — just on an unpredictable schedule. A long gap between periods does not confirm that you have stopped ovulating. Menopause is only confirmed in hindsight, after 12 consecutive months with no period at all.
Perimenopause is the years-long transition when hormones are shifting but ovulation still happens intermittently — so natural pregnancy is still possible. Menopause is the single point 12 months after your final period; once you have reached it, natural conception is no longer expected. If you want to understand where you are in that transition, a hormone panel reviewed by a clinician can give you a clearer picture than symptoms alone.
This page is educational and not medical advice. Whether and when it is safe to stop contraception, and whether any hormone care is appropriate for you, are decisions for a licensed clinician based on your individual history. Hormone therapy is not a contraceptive. Fertility and the timing of menopause vary from person to person; individual results vary.