It’s common to forget to input the exact dates of menstruation, which can impact prediction accuracy. If this happens, you can return to the app and manually add the missed data.

To do this, open the cycle calendar and select the corresponding start or end date of your menstruation. Even if the data is entered late, the app will recalculate the cycle and update predictions accordingly. It’s important to input at least approximate dates if the exact ones are unknown.

To minimize the risk of forgetting, you can set up reminders that will notify you to enter data on the first day of your menstruation.