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Can I Get Pregnant in Perimenopause?

Yes — until 12 months without a period. This calculator estimates your monthly and annual pregnancy risk based on age, cycle and contraception.

Estimated risk

1.5%

per cycle

16.6%

over 12 months

Pregnancy is still possible. Use contraception until 12 months without a period (1 year if 50+, 2 years if <50).

Estimates from FSRH guidance and ESHRE age-fertility data. Not medical advice.

When can I stop contraception?

  • Under 50: 2 years after your last natural period.
  • 50 or over: 1 year after your last natural period.
  • On hormonal contraception masking your cycle: continue until age 55, then stop.
  • Mirena IUD + HRT: Mirena counts as contraception until age 55 if inserted at 45 or later.

Risks of perimenopause pregnancy

Pregnancy in your 40s carries a meaningfully higher chance of miscarriage (around 1 in 2 at 45), chromosomal differences, gestational diabetes and pre-eclampsia. Half of pregnancies in women over 40 are unplanned — often because women assume that irregular periods mean infertility. They don't.

Track your cycles, even when they're chaos.

Lila helps you make sense of perimenopause cycles — and flags when patterns shift.

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