Could I be pregnant?

So I lost my v-card to my bf a few days ago...we used a condom and withdrawal as birth control methods (the condom was used correctly as I was taught how to do so before). I did not notice that the condom broke or anything, and I doubt that I am pregnant but I'm still worried because it has been about 4-5 days that my period is late. Is there a chance that I might be? As I mentioned before I still doubt that I am, but I can't calm down and I need advice. Your help would be greatly appreciated.

Side note: I thought I was emotionally ready..I guess it was just in the heat of the moment