Your fertile window, calculated from your cycle — not a generic 28-day default. No signup, no fluff, everything stays in your browser.

Your fertile window

Ovulation lands about 14 days before your next period — that's true even when cycles aren't 28 days.

–estimated ovulation

The window is wider than the day

An egg lives about a day; sperm live up to five. Test strips catch the LH surge 1–2 days before ovulation — they confirm what a calculator can only estimate.

Ovulation test strips → Pregnancy tests →

If this cycle works

Conceive in this fertile window and here's the ballpark — a first scan is what dates a pregnancy for real.

–estimated due date

Start before the positive test

Folic acid matters most in the first weeks — often before anyone knows. If you're trying, a prenatal now is the standard advice.

See prenatal vitamins →
These are estimates from cycle math, not a diagnosis. Irregular cycles, PCOS, recently stopping hormonal birth control, and breastfeeding all shift ovulation — strips, basal temperature, or a doctor can confirm what a calculator can't. Not medical advice.