TTC BUT SUPER IRP

Okay so me and my boyfriend have been trying to conceive for about three/going on four months now, I’ve always had irregular periods and i took birth control for three years to regulate it to a 28 day cycle / 4 day long period and recently took myself off of it, my first cycle off of it was 66 days long following a 9ish day period 😩 and now I’m 54 days into this cycle and still no period but cramping and back pain like I’d be starting my period for the last two weeks start but also no positive tests, its so hard to tell when I’m ovulating or even if i am because of how irregular my periods are, suggestions please 😩