This is my first time doing BBT and I'm obviously still doing the chart, I'm also using OPK but I'm looking for some input. I've read about it but I guess I'm wondering if this is normal. I have 4 different apps because my glow isn't accurate at all and every app is different for predicting both period and ovulation which is making me feel overwhelmingly confused. Through the fertile window does it normally go up and down? My OPK has come back negative everyday and my other apps show my window being later (and glow seems to keep changing on me as well) but then I questioned my Temps which don't seem very high compared to chart's I've seen (I know everyone is different) Again just looking for some input.