I need outside opinions- PLEASE HELP ASAP

So I missed my period, but haven’t had any other pregnancy symptoms. I was on antibiotics to get rid of a UTI, but I’m not certain that that was what made me skip. My boyfriend’s orgasms have been strange recently, they are random and don’t really have much buildup. We have a lot of unprotected sex(which will be stopping immediately because we are both absolutely petrified about this), and I’m not on the pill or any other hormonal birth control, our only method was condoms and we never really used those.We are 100% certain he didn’t ejaculate inside me, but we’re still kinda freaking out. What are the chances that we could be pregnant?