What’s the possibility?

So I went to take my BC just now and I noticed that the Tuesday and Wednesday pill was missing. And then I looked and realized I never took my Saturday pill. I’m on my sugar pills now and the Saturday pill was the last hormone pill of the month before I started my sugar pills Sunday. I’m normally on time with my pills and never really miss them. I don’t want to take the Saturday pill now tho since I should be getting my period Thursday and don’t want to mess it up. But should I worry about the possibility of pregnancy? We have been having sex at least twice a week.