Fig. 1

Menstrual history of two app users. Menstrual history of two long term Kindara a and Sympto b users. Time is shown in years as relative to the first observation of each user. Kindara user is seeking to achieve pregnancy and shows a long anovulatory episode during which her overall temperature is lower. She returns to more regular, ovulatory cycles in her last year of tracking, as indicated by the bleeding frequency and the temperature profiles. The Sympto user has used the app to avoid pregnancy and observe her cycle for almost 3 years, before trying to conceive, which she likely achieves after 9 cycles (her reported cycle-specific reproductive objective switches from “contraception” to “conception”—line “any tracking” at the bottom). Nine months later, the user reports bleeding, which likely indicates post-partum bleeding (lochia). After another 9 months, probably as she stops breastfeeding, she logs menstrual observations and returns to using the app to avoid pregnancy