Period (menstruation) recurrence is like 40 days, not 28

[FredSPast]

I am seeing this issue with several female athletes, the period recurrence in the future, that should flag it for me to know “the athlete is probably close to her period now” is not at 28 days, but much longer. Furthermore, it is not consistent, if I look at two examples, one is at 41 days, another at 45 days.

Happy to share details about specific athletes in private to fix the bug, but I don’t want to share their health data in public.

[R2Tom]

Here are details how the prediction works

5 days period auto fill

I have had a look and I think the system is behaving correctly. It uses the number of period days and the number of days in the cycle to predict future cycles. This happens as soon as there are 2 or more cycles. So if you start with this: [Screenshot 2025-04-22 at 07.38.15] And make Mon 21st April a period day then the prediction algorithm fills in the rest of the week (and some future weeks e.g. 19th of May): [Screenshot 2025-04-22 at 07.41.53]

[FredSPast]

Thank you, I see it, so it’s probably about lack of consistency reporting, and one missing the reporting of period makes it way longer than it actually is. Thanks, if anything I may give feedback on the other thread.