I think it would be easy for them to filter extremely atypical period patterns - usually you aren’t go to have a one day period. In between spotting is something you talk to a doctor about. Two a month would be awful.
Realistically, think about 4-7 days. Regular cycles, one a month. Usually about the same amount of time between each. To really fake the data, log intensity. Starts with spotting, usually intensifies in the middle, then slows down again. (To be really extra, log some clots lol)
The best way to help would be to pollute the data set with as many fake pregnancies as possible. Log regularly, take a break for about three months, then log another to simulation an abortion or miscarriage.
I think this app is a poop tracker. Tick the days your poops take an extra flush, and then also the days you get a clean release. That should help you track your bowel movements effectively. You're welcome.