of me being pregnant?

I finished my birth control packet of Beyaz on Tuesday, had four sugar pills that ended that Saturday, and I was supposed to resume a new packet Sunday. However, I didn't do so because I was confused on instructions and was still experiencing withdrawal bleeding, so I ended up taking a week off of my birth control. The problem is, I had unprotected sex with my boyfriend the following Saturday (the Saturday before the Sunday I started to resume a new packet of birth control) - he didn't ejaculate inside of me, though. Just around my vaginal opening. What are the chances of pregnancy considering I don't think I was protected when we had sex?