How do I track my fertile window?

Bottom lineTrack your fertile window - the 5 days before ovulation plus ovulation day - by estimating ovulation from your cycle length, watching for clear stretchy egg-white cervical mucus, optionally using ovulation kits to catch the LH surge, and charting temperature to confirm ovulation afterward; lean on real-time signs like mucus and kits if your cycles are irregular.

Your fertile window is the roughly 6 days each cycle when sex can lead to pregnancy - the 5 days before ovulation plus ovulation day. You can pinpoint it by combining your cycle data with body signs.

Step by step

1. Track your cycle length for a few months to estimate when you ovulate (often 12 to 16 days before your next period)
2. Watch cervical mucus - the clear, stretchy, egg-white kind marks your most fertile days
3. Use ovulation predictor kits if you want to catch the LH surge
4. Chart your temperature to confirm ovulation afterward and refine future estimates

Reading the signs together

• Mucus and kits warn ovulation is coming - your best time to try
• The temperature rise confirms it has passed
• Over several cycles, the patterns line up and prediction gets sharper

If your cycles are irregular

Estimating from cycle length alone is less reliable, so lean more on real-time signs like mucus and kits. Persistent irregularity is worth raising with a clinician.

Femora predicts your fertile window from your logged cycles and sharpens the estimate as you add data.

Calculate it: fertile window calculator