Just that really. Periods regular and on time. It's an app on the phone which gives safe days for sex after tracking your cycle a few times.
i was on the mini pill but didn't agree, also have extensive pelvic adhesions (mainly on one side though) due to previous surgery so GP says fertility probably low anyway- along with my age (43)
unsure as to using it though due to age and possibility of odd cycles etc. Been advised not to get pregnant again due to many surgeries and abdominal scarring.