Is starting a new pack a week late okay?

I am on vacation and I am staying a week longer than expected, so therefore I will not have birth control to take for that entire week. Is it okay to not start a new pack till a week after? I will not be having unprotected sex in that time period, but I did this week (the week before the sugar pills). Do I have a chance of getting pregnant if I don’t start a new pack in time?