What Is a Fertile Window?

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The short version

The fertile window is the span of days in a cycle when pregnancy is most likely — roughly the days leading up to and including ovulation.

Why it isn't the same date every month

Ovulation timing shifts with cycle length, stress, illness and other factors, which is why an estimate based on your own logged history tends to be more useful than a fixed day count.

How the app estimates it

Estimates are calculated from your own logged cycle history rather than a fixed assumption — accuracy typically improves as more cycles are logged.

What this isn't

A fertile-window estimate is not a guarantee and not a substitute for medical fertility guidance — see the Medical Disclaimer.