Help please! I'm so confused!

Glow predicted my fertile window to be the 12th-18th (peak being the 16th) during that time I had EWCM mixed with some creamy CM. And cervix was high, med, and about med open. Just checked tonight CM was still EWCM mixed with creamy CM,  and cervix is med, very soft, and very open. Glow predicts AF is due 3/31- so 10 days... What does this mean? Could my fertile window prediction be wrong? I don't want to miss it!