could I be pregnant?

i'm in a long distance relationship and after over 100 days, I finally saw my boyfriend. we had sex a lot, and I think there was 4 times where it was unprotected and he didn't pull out, but i'm on birth control pills. my reasoning of me thinking i'm pregnant is because there was a few times the week before I had sex where I took my pill a few hours late.  is there anyway I could still be pregnant? I think i'm just paranoid cause it was my first time unprotected but please let me know your thoughts!