OPK test strips ?!

Amanda
I'm so confused with OPK strips!  This month I got my positive OPK on CD 15 had sex on CD 16 and it was also positive. And then I had sex on CD 20. Did I miss the egg release ?? I took two test BFN for both😔. Should I just keep having sex and tracking the OPK strips until it's not positive anymore cause that would mean the egg releases already right?