You could. It is unlikely that you are - but anything is possible.

Wait until your next period is due before worrying over it. If it is late, take a test.

And the whole condom thing? It is pretty obvious when they put one on... you know, just an FYI for future reference.

uhhh yeah you could be pregnant anytime you had unprotected sex

how did you not know he didnt have a condom on