Yep, start taking the Pills on the day your period starts. You take it for 21 days and then you have 7 days break. During that break time, you do not need protection if you don't want it and you should be having your periods. After that 7 days is over, you start taking the Pills again and the cycle begins.

Some people say that the Pills make em gain weight but it lightens the flow of your periods, so there's always a good and bad side of things.