57 Day Cycle?

I haven’t had my period for a month now which is really weird. I got off birth control recently which may be the cause but also have unprotected sex. The first time was right before the last time my period started which was the end of July and it was surprising bc I had just ended my last cycle only 2 weeks prior. I was estimated to ovulate in the very beginning of August bc of how short my last cycle was and then get my period again but it never came and I didn’t have sex in the ovulation time window but my period still hasn’t come and I spotted today so I’m very worried I may be pregnant. I don’t think I could’ve had sex when I was ovulating bc I had it a good 3 weeks after my period had ended when ovulation usually occurs on the 12-16 day of your cycle. Very confused would love some insight.