Pain after sex

So, girls, my boy and myself, we don't have many opportunities for having sex so, yesterday we were at his place, his parents went out and we got so enthusiastic we had a marvellous quick sex, it was great, so great that in 20 minutes we had another round, this one was long and savage. Well it was awesome, but a little later my legs hurt so much, and I feel swollen, my body feels like I have fever, maybe is just because of the exercise, but I wanted to ask you people. Sorry for my spelling, English is not my mother language