When did this happen? You could have gotten Plan B to protect yourself.
Wait until you miss a period, and then take a pregnancy test. That's really all you can do now.
As far as your boyfriend's concerned, I hope he's just not contacting you because he's just as scared as you are. Maybe he's in denial about the whole thing. Or maybe he's a dirt bag. I don't know. I'd personally try not to worry about him until you find out one way or another if you're pregnant or not. Either he'll call you or he won't, and if he won't... maybe that's a sign.
In the future, never have sex without protection. Don't put yourself at risk like this.
Good luck.