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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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