Pregnancy sex

I am currently 14w3d. Usually when we have sex Im on top and it isn't very rough. Yesterday was my brithday though so we switched stuff up and he was on top. He was going a little bit rough and when we were done the whole sheet was soaking wet. I have no idea what happened. I don't think I was THAT wet. He says it's wasn't from his cum. Has this ever happened to any of you ladies?