As I read your comment, you say you had a period two weeks after your first had sex. That should be a pretty good sign that you aren't pregnant, right?
If your boyfriend was using a condom, and withdrew with it only about "3 seconds" after he came, he really didn't have time to "deflate" and so, if he pulled the whole thing out, why are you worrying? He did everything right.
Now, he and you may have wished that intercourse had lasted longer than just "5 seconds until he came" and then "3 seconds more"... but that takes experience and practice.
Except for first time jitters, I don't know why you would suspect that you might be pregnant?!
Use birthcontrol every time, and make certain your partner knows:
1) to apply it before he touches or enters you
2) to hang onto it before he withdraws, so that it comes out with him.
3) NOT to use any lube that has oil-based formula...like vasolene, baby oil, or anything similar. The problem is that oil or petroleum based products will attack and weaken laytex and rubber products from the moment they make contact. And the impact is so serious that the condom could break during sex.
Take care. Let us know how it turns out, OK?
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