it would depend on where in your cycle you are when you start the pills. if you start on day one of your cycle which is the first day of menstruation you are protected from pregnancy immediately. if you start on the first sunday after your period starts you should use a backup method of contraception for seven days. after the first seven days you are protected from pregnancy.
how long do you have to take microgestin fe before it's safe to have sex and be protected from pregnancy?