She's not pregnant you dolt, I know it happens but the odds are fucking S L I M. You need to just fucking chill out. I know it is scary and shit. I dated a girl when I was 16 and she was 14 and we had a sexual relationship and she was about 2 months late. It was unfunny. I was cracking baby jokes and shit trying to deal with it. eventually She had her period and I was so happy I cried> Anyway, Even if she is pregnant just tell her it's an abortion or your skipping town. Throw her 400 bucks to cover the cab the abortion and a night of her drowning her sorrows with alcohol. Tell her that's all you willing to spend on this kid .Also call her Vaccum Crotch.. I hear they dig that shit. Just chill out till then. Everything is gonna be cool.
Also, She so fucking lied to you about being a virgin. Even retards have sex before turning 21. Unless she was on a desert island till the day before you fucked her, someone else got to her first.