hi there. im wondering how long you should wait to have unprotected sex when you start taking birth control for the first time?? i just went to the doctor yesterday and she told me it was helpful to regulate my period but i also want to know how long i should wait to have unprotected sex. i started my period last friday night after taking a PLAN B pill..she told me i could start the pill this sunday because im still on my period..but after this sunday exactly how long should i wait..i dont want to take the risk of getting pregnant.. please help??...what should i do??