That's weird... I couldn't tell you. But that is definitely not normal, and you should have that checked out.

The only thing I can think of why that would happen is if it was your first time, or if sex is a little rough. Did it just happen the one time ? Maybe he cut you some how ?? (sharp finger nails ?)

if it keeps happening, you should go to the doctor to get checked out.

Maybe your having an early period???

It happens to me occasionally!!