What do I do?

I have a laparoscopy surgery on Monday where they will look for endometriosis and if they find any they will take it out, they are also taking out a cyst. Last night me and my so had sex... Unfortunately we didn't use protection and he said that he came inside of me. I'm fully aware of my immature decision last night and I take full responsibility. I was just wondering if taking the plan b would interfere with the procedure? If I took it today (Friday) and my surgery is early Monday morning would I be okay? I've left a message for my doctor but haven't been contacted back yet and I know they aren't open on weekends. Please any advice would help