Friendly reminder / public service announcement that those apps often store/share data that can be used against you if you live in a state with strict forced birth laws. Be sure to thoroughly read the privacy policy and if in doubt, go back to a paper calendar. Stay safe.
So true. OP looks like they’re using iOS and I know the stock health app has a period tracker. Probably a safer place for your data, though not perfect.
My body has no consistency, I've come to accept it. What is infuriating is how hard it is to get a serious discussion going with an expert to verify if it's nothing to worry about or something that can be treated... a lot of menstruation related health issues go un-noticed.