Sex right after period

Rebecca

My boyfriend and I had sex a day or two after my period stopped, and the day after that as well. He came inside me both times.

Since I know it's very hard to get pregnant right after your period, I didn't take plan B. But a few days later my boobs were KILLING me. This usually doesn't happen until a week before my period and they don't hurt as bad as they did. They are still sore now but not as bad.

Any thoughts?