Suggestions for FemTech app

I am building a health tech app that will focus on wellness and health specifically for female users.
As you would guess, a big central component of this will be sending users notifications and suggestions based on where they are in their menstrual cycle.

Can anyone please suggest how can I design a cycle tracker or incorporate an existing one, and derive information from it to segment users and help them with their daily journey?

Thank you.

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