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Menstruation apps: What happens to your data and how it can be used to criminalize abortion
(english.elpais.com)
Icon base by Lorc under CC BY 3.0 with modifications to add a gradient
Y'all, the F-droid store has a lot of open source, tracker-free period-tracking apps. If you're on Android, at least, and then it all might go away in a year. BUT for now, it's helpful.
Root while you can. Or use shizuku.
Haven't had time to review these: But these 2 I’ve been rec. for.