I've been on the pill for 7 months now and me and my boyfriend have sex without a condom (when we would, I would get allergic reactions. We tried tons of them and nothing was helping) anyways we had sex without and condom and he's very good at pulling out but this time he didn't, when he realized he was coming he was already done when he pulled out and started to freak out and so did I. Later that night I took my birth control when I'm supposed to and one hour later I was bleeding... What could that mean? We talked about getting Plan B but last Time I took that, which was a year ago, I was down for 3 days with a fever and not feeling well. I don't know what to do.

What does it mean?