15 year Old Girlfriend might be pregnant...NEED ADVICE!

Okay, so about 3 weeks ago my girlfriend was very horny and wanted to fuck, so I did and I didn't have a condom at all and I thought I'd just pull-out, which I did. But I had no clue there is such a thing as pre-cum. I am so fucked if she is pregnant because she hasn't had her period at all and she is getting emotional. I am 18 years old and she is 15 years old, I will just be so fucked it isn't even funny and we aren't trash at all. Her and I are both high class citizens...What should I do? She wants an abortion and so do I but she thinks if she gets an abortion she will go to hell....