Glow predicted my period should have started yesterday April 24th based on my last period starting April 1st, & my cycle of 27 days. So when i didnt get it I went back to see if I were ovulating the last time i had sex which was april 9th. It said i was 30.7% risk of pregnancy this day which is the highest. I started freaking out thinking i may be pregnant & did so for about 2 hours before I went back into the app & counted the 27 days of my cycle myself & got a different period start date! I saw a button that said "my period is late", pressed it and Glow recalculated my period to start on the date I got on my own. WTH??? Why was it incorrect in the first place? Scared the hell out of me!