Usually my OPK shows positive on the same day as glow predicts.This month, my periods came about 6 days early and also my OPK shows negative and is out of sync with what glow shows me.According to glow I have already missed my peak day :( Has anyone conceived about 2 days after peak day? I am just confused if to wait for +ve OPK or believe <a href="https://play.google.com/store/apps/details?id=com.glow.android">Glow app</a>. :(