broken condom

My boyfriend and I had protected sex last night but sometime during it, the condom broke. He pulled out as he was cumming and realized it broke. I immediately reached inside myself and pulled out some cum. However, most of it did get on the car seat. I do take birth control, but some days, I'm maybe a minute or two off. I'm just wondering if there's a chance of me being pregnant. I think I am but he mainly came on the seat and towards the entrance of my vagina