Pregnancy scare

So, one week ago (Oct 30-31) my boyfriend and I had sex multiple times, and once he used the pull out method. I was on my last two ovulation days at the time. I'm supposed to have my period in 8 days...should I be worried? This is the only person I've been careless with. Also last night we had sex and he didn't pull out at all, but I'm taking the plan B pill today for the first time. This is just a really scary time for me. :( advice?