Your cycle details
Count from the first day of one period to the first day of the next. The average is 28 days, but 21-35 is normal.
The days from ovulation to your next period. 14 is typical; leave it unless you know yours.
Most fertile window (this cycle)
Mar 10 - Mon, Mar 16, 2026
Estimated ovulation: Sun, Mar 15, 2026
| Cycle | Fertile window | Ovulation | Next period |
|---|---|---|---|
| This | Mar 10 - Mar 16 | Mar 15 | Mar 29 |
| +1 | Apr 7 - Apr 13 | Apr 12 | Apr 26 |
| +2 | May 5 - May 11 | May 10 | May 24 |
The fertile window is the 5 days before ovulation plus ovulation day, when conception is most likely. This is an estimate based on average timing - cycles vary, and ovulation tests or tracking give a more precise picture. Not a form of contraception.