When starting a new pack of birth control pills do you have to wait to have sex or you are protected ? had sex as soon as period end at the begnining

Yes: If you have been on the pill and are simply starting a new pack on schedule then you continue to be protected. If you are just starting the birth control pill and you begin them with your period you are protected. If you are just starting the pill but not on the first day of your period there is a slightly increased risk but you are probably still protected.