Birth control and antibiotics

Hey guys! So i’ve been taking antibiotics for about a week and a half now for my acne and i know that some antibiotics mess up birth control (i have the implant). But I looked up how the specific antibiotic i’m taking will effect my birth control and it said that it shouldn’t. Me and my bf had unprotected sex last week....should i take a pregnancy test? or should i not be worried? I’m only asking bc i haven’t had my period since christmas but ever since i been on birth control (it’s been 2 years) my period hasn’t been regular. I just don’t know what to do😂🙄