Besides logging your period, tracking data like your basal body temperature, cervical fluid, and even physical and emotional symptoms can help pinpoint your fertile window and give you more information about your body in general. Ovia uses all of this data to give you accurate fertile window and period predictions as well as personalized feedback about your health and fertility. The more data you can log in Ovia, the better Ovia will come to know your cycles. You can track all of the following data:

You can read more here.