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Birth Year

This helps us figure out your approximate age while minimizing the data we store for additional privacy.

First Day of Last Menstrual Period

This data is critical to determine the start day of your cycle to be able to sync your observations with your hormonal cycle.

More than 6 months ago?

This may apply in two cases:

Postpartum: Enter your delivery date as the start. It isn't a true period, so your charts and predictions may not be accurate.
Very long cycle: Enter the date you started tracking data. Your charts and predictions may not be accurate until new cycles are recorded.

Dates more than 6 months ago are not accepted.

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