I doubt you're pregnant but if you think you are then take a test or see your Doctor to ease your mind.
I agree risk of pregnancy is low risk of infection is much greater. I'd see the gyno to make sure everything is ok.
Essentially it's the same as if you didn't use a condom. However, because you were on the pill religiously I think your chances are low. Birth control DOES fail, I got pregnant while taking it at the same time every day with no missed pills, but the fail rate is very low. I would be more concerned about infection, and I think you need to get to a doctor and have a test done ASAP...before this week is over. I wouldn't worry about pregnancy until/if you miss your period, but I think you should be OK. Get checked for infection though!
best of luck