Me and my girlfriend just had sex for the first time and after she was complaining about a lower back pain and a pain just above her vagina. She bled so is this just a pain from breaking her hymen?

Prior to having she was your girlfriend a virgin?

Yes

Sounds normal to me, but if her pain persist she should see a doctor. You seem young, I hope you two are practicing safe sex.

I'm 16 and she is 15 I'm just nervous

i'm 16 and she is 15 i'm just nervous

And you should be nervous. You know that sex = pregnancy, which would make you a father.

What feels good for a few moments could cause you a lifetime of grief. You are way too young to be responsible for a baby and she is way too young to take care of a baby.