I had sex with my boyfriend a week and two days ago, but I was on my period. The condom broke, but we don't know when, and he had already came. I am on birth control, but my period is lasting longer then normal.. Is that a sign of me being pregnant?

The first sign of pregnancy is absence of your period. I doubt you are pregnant.

I do think you should do some research on how your body "works" in order to understand your menstrual cycle and pregnancy.