Worried a little

So the other day I had sex with this boy I know but not like know know him. And he wanted to hang out but I told him he had to promise me we would have sex but he broke it and we did and we had U petered sex and he did the pull out method and I'm on birth control but I accidentally took a vitamin for my hair and I read that u can't take vitamins if your on birth control because it would be less effective so the question is should I be worried that I would get pregnant