My period is pretty accurate with Glow's period prediction , and I haven't logged anything since May 30th , and last night around 2am I went to log in sex for the day before. As I opened the app it said I was on my fourth day on my period .  Glow has only been wrong for 2 days after period started . Anyways this post is just to vent and say I kind of wish I didn't open the app, because throughout the day I've been debating to head to the store and get a HPT and let my SO know I'm 4 days late . Luckily for me, I just went on with my day waiting and it's 7:00 and miss af came . Devastated but I knew it was to good to be true . I've ttc for 2years now . One day . . .