hi, i start taking 'yasmin' everything thursday, this month a started it a week late after my period ended because i didnt have a new package in time. so therefore i started my new yasmin pack on the following thursday. 3 days after that, ( sunday) i had sexual intercourse and i am not sure if i shouold take plan b tomorrow, or if there is an equivelant amount of birth control to plan b.. or even if the regular birth control will work