If she says she is pregnant, you will need to have bloodwork done on the baby to determine whether or not you are a father. Obviously if you are, you will need to take responsibility for your actions.
You REALLY need to get some sex education. Girls CAN get pregnant, even without full penetration, and you are very clearly not ready for the responsibility of caring for another human being.
Also, drinking to the point where you are unsure whether or not you had sex with someone is not normal behavior. It sounds like you have a drinking problem. You might want to consider how you wish to handle it.
Relax... I'll need some information first. Just the basic facts - can you show me where it hurts?