No idea when I ovulate

Kristin • Expecting #1 in December. Our greatest gift from God after mc last oct. So thrilled
I have been doing ovulation tests and no positives yet. According to the app I was suppose to have ovulated a few days ago. When I entered negative test it moved my fertile window and next period out. This is my first month off the pill and first month were trying. Anyone else gone thru this after they got off the pill!