Okay so, my boyfriend and I had sex last night and he pulled out and I've been on the pill for about 3 years now and I've never missed one and anyway I had a root canal that they think may have given me a mouth infection so they prescribed me penicillin Which I will start tomorrow morning and on the bottle it does say that it can effect the effectiveness of my birth control but is that only when I'm taking it and for the rest of the month after I'm done? I just don't know what to do