PLS HELP (Comments/advice)

I’ve been on the pill, never missed, always within about 2 hours (roughly the same time and almost always at 5:30 the only time i’m ever early or later on time is bc of work) and i got on an antibiotic . I had sex with my boyfriend and we used a condom but the very base of it unrolled. Should i be scared of pregnancy or do you think i’m just overreacting because i feel like i do this alot😂 (i guess that’s normal though. I don’t feel like i could have gotten sperm in me but i stupidly kept going until he was completely finished and the base of it didn’t roll very much at all. I’m always very VERY careful when it comes to sex and this is the first time something like this has happened