Ovulation day different than Glow?

Candra

So before going off birth control my cycle always varied between 1-3 days, so Glow had me ovulating this past Sunday. I am curious how many people experience different ovulation days than Glow predicts?

I am pretty sure I experienced the EWCM either Sunday (8/2) or Tuesday (8/4) and didn't have much of any kind of cm this Sunday (glows predicted ovulation day). What's your experience with the accuracy of the prediction?