First, children shouldn't be having sex. There is a boy on here only one year younger than you who hasn't even reached puberty yet!!

Secondly, there could be a lot of things causing her discharge, but it sounds mostly like it is due to the sexual intercourse. If she is filling more than 2 pads an hour then she needs to go to a doctor. If the bleeding dosn't subside within a week or two, then she also needs to go to the doctor.

My recomendation in the future is this: Don't have sex. You're too young. I'd suggest waiting until the legal age of consent in your area. There's a lot that you and she can do together that doesn't involve your penis inside her vagina - especially since it causes her pain!!

Until you both reach the age of legal consent, you are raping each other according to the law and if caught, you will both be in a lot of trouble - but probably mostly you, unfortunately. The male is almost always blamed in these cases.

You can still explore oral sex if you really have a desire to have sexual contact. But your girlfriend is not on birth control as she should be in order to prevent pregnancy, and condoms are not effective unless used perfectly. I'm 22, and even my fiancee and I don't always use them right. But I'm also on the pill.

Your girlfriend is too young to risk getting pregnant. A pregnancy would do horrible things to her body and if she didn't get an abortion, then birth would be extremely dangerous. Am I trying to scare you? Yes, I am.

Use mutual masturbation, discover 69-ing (giving oral sex to each other at the same time), maybe even use sex-toys (not that you're even old enough to buy them!!).

I agree with eiri that you probably are not ready for sex. You should know a lot more about it before actually doing it. All girls need to see an ob-gyn once they become sexually active. You said she had sex before you, so she should be seeing one already. The bleeding is probably just from a tear inside the vagina. That's common since the vagina is so delicate. It can tear easily without people even realizing it. However, it certainly would not hurt to have her ask her ob-gyn about it. You might just need to use lubrication in the future. That is probably why she felt pain. That's why you should know things before actually doing it. Pain and bleeding can be avoided in most cases if the two people just know a little bit about reproductive anatomy before jumping right into sex.