Question for the BC pill users

Hi there! I'm on the pill, and Glow is not predicting my next periods correctly... I have the 28 day pills... What do I set my glow cycle days on to get accurate period reminders? I sort of know when to expect my next period (this is my third pack, have only been using it for three months, and I got my first period two months before starting the pill, yes, I'm a very late bloomer), but it would be nice not having to count the number of pills left until my period week. Any suggestions? Thank you!!!