So, I had unprotected sex. I take my birth control very very regularly and timely. When I had sex, I was about two days off my period. I let him finish inside me. He said it was no big deal, he'd done it before and never had a problem with it. However I then mentioned that I had been taking an antibiotic... We hurried to our nearest CVS, and bought a plan B. It took it within the first two hours. I think I'm safe, and not pregnant, but it's always good to get second opinions and thoughts on the matter. What do you think?