Whats going on here??

Hi everyone can i get some advice please? My app seems to be changing on me. This is about the 3rd time i noticed my glow predictions have been changing. 3 different times i was like good im ovulating today but go to look and is pushed back again. Same goes for my predicated period that keeps changing too. Felt great with all my baby dance attemps and now finding out it wasnt on the days it was ment too. Feeling abit crampy and wondering if i still have a chance. Anyone elses glow doing this too?