Ovulation day keeps moving 😱

jenny • Tue, Sep 03

Can anybody help me??? So this is the 2/3rd time this has happened to me. All month my ovulation day was yesterday, 2nd Sept. We BD yesterday, and planned on doing it today as well. Just took my BBT and OPK, saved the info and now my ovulation day has moved to tomorrow!!! Which day is my ovulation day and why does it always move??? Please help!!