Hey there! New to the glow community. I started using Glow in September to predict my periods and ovulation after I went off my bc pills. Well in November I decided to use the test sticks to see if it predicted my cycle correctly (usually 33 day cycle) I ended up with a surge on Dec 1st, a week after it said I should. Now I don't know when to test because it moved my predicted AF date to the 16th (making it a 38 day cycle). I've been using Ovia too and they say I'm due for AF on the 10th and to test on the 13th. I took a pregnancy test yesterday and of course it was negative (probably too early).