Quoting Landen Wyatt's Mama:" My most recent relationship lasted two months and we had sex like 2 days after i got off my period last ... [snip!] ... still no period and i can't make an appt. till monday and my question is, if you were in my situation would you abort or what?"
I agree that you should find out if you're pregnant first. If you go to the dollar store they have pregnancy test that are pretty much the same as they use in a doctor's office. I'd take one if you are really that worried.
With that said, you have consensual intercourse with a man. Contraceptives are only 99.9% effective (if that), and most people are aware that the only sure way to avoid pregnancy is abstinence, meaning that you probably knew that by having intercourse you risked the chance of getting pregnant. It is not the fault of the child that you chose to have sex. I'm not saying you should keep the baby, but strongly consider adoption over abortion.
That's just my opinion though.