Wearable device for period tracking?

I always found it boring and time consuming to fill in the data manually. Sometimes I even forget that I had a particular symptom during the day which makes the log less accurate.

There are so many activity trackers out there, why there's nothing thay would track everything automatically? Would you buy a device that would track your cycle when glow app is not around? (looking at cool tech, surprised there's nothing about menstrual health out there)