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
I agree risk of pregnancy is low risk of infection is much greater. I'd see the gyno to make sure everything is ok.
I doubt you're pregnant but if you think you are then take a test or see your Doctor to ease your mind.