Sore after sex

I had sex for the first time Monday with my boyfriend whom i love with all my heart. We had sex again on Tuesday and Wednesday, with wednesday lasting the longest and being the roughest. Today i woke up with pressure in my butt. This could just be from pmsing and being constipated or just my not washing good enough of whatever. But i wanted to see what you guys thought. We used a condom and he pulled out each time, i peed and cleaned after, and he tested clean for gonorrhea and chlamydia. Any thoughts? I'm probably just overreacting (i do that a lot).