Good grief people. She is not pregnant. I was just looking on a pregnancy forum, and there are married couples who have used no method of birth control other than pulling out right before the guy ejaculates who didn't have a child until they wanted to (so, no pregnancy for 5-6 years of pulling out).
Now, I am by no means advocating this as a birth control method, however if I were in your situation I would not run out and buy a morning after pill.
Also, and I'm going to put this in yellow so you are sure to read it:
DO NOT KEEP CONDOMS IN THE CAR
The reason for this is that heat can cause the latex in them to break down and, er, break.
Your wallet isn't the greatest place for them either, for the same reason (unless you carry it in a man-purse...but you're getting laid, so I'm guessing not...
), better to have them in a nightstand or medicine cabinet or under a bed or something, or stick one in your wallet/pocket if you think you'll need it that night.