Ovulation help!!

Omg, idk what is going on with my body! So three days ago my ovulation strip showed I was just about to be a positive (like the very last negative it could be according to this app). So then two days ago I assumed it would show positive but it was as negative as it could be. Yesterday was, again, just right before the positive mark and today another true negative!!!😡😡😡What the heck?! I wanted to start crying because I should’ve ovulated yesterday. This is my 3rd month testing and I’ve been regular the past 2. Any advice would be great!