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When is the fertile window and how often should we have sex?

The fertile window is the five days before ovulation plus the day of ovulation. Every 1–2 days across that window works as well as precision timing.

Reviewed by Lunara Expert Advisory Panel · May 2026

Sperm can survive in fertile cervical mucus for up to five days; the egg is viable for roughly 12–24 hours. That asymmetry is why the days before ovulation matter more than the day after.

Studies consistently show the highest conception rates in the two days before ovulation and on the day itself. Having sex every one to two days across the fertile window performs about as well as trying to hit an exact hour, and is far less stressful.

Daily ejaculation does not meaningfully deplete sperm counts in most men, and long abstinence does not improve outcomes — sperm quality tends to decline after several days of abstinence.

The short version

  • Fertile window = five days before ovulation plus ovulation day.
  • Every 1–2 days across the window is sufficient.
  • Long abstinence does not improve sperm quality.

When to talk to a clinician

  • Pain during sex, which can point to endometriosis or other treatable conditions.
  • Difficulty with intercourse timing due to erectile or ejaculatory issues.

Related answers

How long should it take to get pregnant?

Around 85% of couples conceive within 12 months of regular unprotected sex. Evaluation is advised at 12 months, or 6 months if you are 35 or older.

Read

How do I know if I actually ovulated?

An LH surge predicts ovulation; a sustained temperature rise, luteal-phase symptoms, or a progesterone blood test confirm it happened.

Read

Educational information only. Ask Lunara is a search layer over expert-reviewed content and does not provide diagnosis or personal medical advice. These statements have not been evaluated by the FDA. Always talk with your healthcare provider about your own situation.