Am I pregnant?

So me and my boyfriend got a hotel after prom. He's 18 and I'm 17, we've been dating a year and a half and we've been having sex regularly for a while, I only waited about a month after dating to have sex with him. I was on birth control, the pill, shortly after we started having sex but we took a break around December and I stopped taking it and never got back on it. My mom just acted weird about it and I will eventually but haven't yet.. we only use condoms like half the time. So after prom we had sex like... a lot of times. He didn't plan on wearing condoms and I knew that.. he came inside me five times. I've never had anyone cum inside me before, I knew he wanted to and he bought plan b but I didn't know he would so many times. I only took one plan b, a couple hours after the last time we had sex. Is this okay? Should I take another one? This was less than 48 hours ago. I'm just really scared I might be pregnant. I kind of understand that there are only a few days of the month that you could possibly get pregnant though? Or is that a myth? I haven't had my period in like 3 weeks. Thanks :)