Opk question

So here’s my cycle this month. I typically ovulate around CD 18-19. I’m July I got a positive opk on CD 17. And a peak opk on CD 18. I only have a few test strips left. So I’ve been taking them at night the last 4-5 nights. They all come back low. I’ve also been checking my CM and cervix the last couple months to help predict my fertile days. The last two days I’ve had egg white like CM and my cervix is high, soft and open. But still no positive opk. We’ve been BD…

But has anyone NOT gotten a positive opk during a cycle before? Or maybe I’m going to ovulate really late this cycle. 🤷‍♀️

Anyone NOT get a positive opk but still ovulate and conceive?

I’m just confused why I’m not getting a positive opk yet.