Unprotected sex

Hey girlies...sooo me and my bf had sex yesterday but he didn't use a condom5 bc he didn't have one with him This have happened 4 more times but the think is that now I for a little anxious bc okay so when he had sex he wasn't all the time in he did for like 2 minutes and then he stopped so he didn't cum inside and then do it again.This happened manyy times yesterday and I'm on my day 18 of my circle do u think that I am get pregnant from that bc i mean we were very careful with that but I'm freaking out