Dude, come on. I can't even believe you're entertaining the idea that you might have gotten her pregnant.
I'm guessing you're like 15 years old or something. Otherwise, you would really know better. You can't get pregnant without having sex. And you especially can't get pregnant if you didn't have sex AND didn't ejaculate. It's physically, biologically impossible.
I don't want to speculate on your relationship, but one of the following is going on. Either your girlfriend knows she's not pregnant and made the whole story up for attention, as young girls are prone to do. Or she thinks she is pregnant, in which case you both are extremely uneducated and have no business messing around if you don't even know the basics about the birds and the bees!
But don't worry, you're not having an effing baby. (rolling eyes)