Oooh! That's a real swift kick in the satchel. You have my deepest sympathies.
My advice is to talk things over with somebody that you're close to - a friend, relative, pastor (rabbi, swami, priest, dark lord, etc.), or neighbor. It's fine to vent here too, but nothing beats a face to face conversation. Whenever you're looking to escape it all, turn your brain off for a few moments and play some video games. It's far better to take out your aggressions on a digital opponent than to do (or say) something that you'll later regret.
P.S. - I'd insist on a paternity test if there is any question about the pregnancy. Once your name is on the birth certificate, it is very difficult to get out of paying child support - even when a later paternity test proves that you are not the father. Unfortunately, the courts are more worried about the child's welfare than they are about assessing proper responsibilities. I guess that it's good for the child, but it's not so good for your pocketbook.