I have a very clear temp shift starting CD20 but glow thinks I ovulated CD18. I notice a LOT of people on these boards are "late" but don't end up pregnant. Is anyone tracking the instances of inaccurate ovulation dates like mine clearly is? It's way more likely that the estimated start of menstruation is wrong due to late ovulation and I'm inputting cm, bbt and OPK and its estimating mine wrong. Imagine how wrong it is with just dates most users are inputting.