Is Pregnancy Possible Due To Unprotected Intercourse?

HI i have a question about my birth control. i recently had unprotected sex three times in one day while i was on the last week of my pills. (after my period) i was suposed to start my next months pills the next day and i forgot. so two days after having unprotected sex i took two to make up for the day i forgot. im worried i might be pregnant..and i dont know what to do or if there is anything i can do. i cant wait a whole month..do you think i should be worried?