Maybe I’m being a bit paranoid, but I do not trust any app to have my information in that way anymore.
If you experience a menstrual cycle and have not gotten into the habit of tracking it, not only is it a relatively easy thing to do, you learn so much about yourself through the process. I have been tuning in for years now and it’s really easy for me to know what phase I am in with certain cues from my body. I just use a physical calendar now to mark the beginning of my menstruation and the end, and I mark down where I suspect I’m ovulating. This is very valuable information always, but it seems could be valuable for our safety in current times as well. Let’s hope I’m wrong!