Um im not sure about what coud have caused it , maybe yer cervix is sensitive or shorter then normal , i really dont know. alot of people have pain after sex but i dont think it would last for 2 days. If it continues everytime i would see a dr, he mighta been to rough and hit ya in the wrong spot but i really cant tell ya for sure, if its a really bad pain or ur really concerned check with your OB.