There is a chance you can be pregnant while using birth control but it's very, very slim as long as it didn't break, there were no holes, and it was used properly. I'm sure you'll be just fine! Don't stress over it, because that can delay your period. Maybe think about going to a free clinic and getting some pills or a different back up method of birth control as well as condoms so you don't have to worry, good luck!
It's very unlikely for you to be pregnant as you used a condom and it did not break. It's not completely impossible, but it's not worth stressing too much about it. If you miss your cycle, then you need to take a test. Now would be a good time to talk to your doctor about additional birth control options such as oral contraceptives. It will give you more reassurance that you are using adequate means to prevent pregnancy.
Take a pregnant test to be sure