Your RHR increases after you ovulate each month, and then tapers off again after your period starts. I can see it with my Fitbit! : r/fitbit
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Fitbit female health tracking and period tracker explained
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Does your rhr change in a cyclical way through the month like this? : r/ fitbit
An Honest Review of Fitbit for Menstrual Cycle Tracking – Leslie at Chart Your Fertility
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Fitbit and Ovulation. | Mumsnet
/cdn.vox-cdn.com/uploads/chorus_asset/file/19655190/Screenshot_20200129_113959.png "How to use Fitbit's female health tracking tool - The Verge")