Negative OPK...EVERY DAMN TIME

Alright so I already spoke to my doctor about fertility cause I have super irregular periods. So I’ve been tracking everything. But every time I take an opk it’s negative, so it pushes my ovulation back and my period. My bf and I have been TTC during when the app says I’m fertile so to speak but now I’m worried did I miss my window? Am I even ovulating? What if when I’m suppose to get my period I don’t and it’s because it’s doing it’s disappearing act on me. Has anyone experienced this many negative opk? And what have you found to help you?