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Compare · Ovulation Calculator

Two independent scenarios side by side.

Scenario A

Ovulation

First day of last period

Cycle length

days

Ovulation day

5/1/2026

Fertile window

4/26/2026 – 5/2/2026

Scenario B

Ovulation

First day of last period

Cycle length

days

Ovulation day

5/1/2026

Fertile window

4/26/2026 – 5/2/2026