could i be pregnant?

i had sex about 6 weeks ago, i was drunk and we started then stopped(he didn’t finish) it wasn’t protected, i was on the pill but i was also on a antibiotic at the time. online it said that the antibiotics i was on is fine with my birth control, but i was scared so i took a plan B to be safe. he didn’t cum, i was on the pill and incase of my pill getting canceled by my antibiotics i took plan B, should i be fine??