Depo + antibiotics

I'm on the depo shot and I know that antibiotics can interfere with some birth control, but I read on a British planned parenthood site the it wouldn't affect the shot. 
​Anyway, me and my boyfriend were having sex while I was on antibiotics and we haven't had sex for about 3 weeks and I'm all bloated, peeing every hour and I was nauseous for the few days. Is it possible that I'm pregnant because of the antibiotics?