For a friend of mine it took four months for her body to regulate to the cycle of no period on the days of the pills that have one color and then have a period on the pills that are seven pills of the same color.

it took me two months to regulate to the pills cycling.

another friend was right on the cycle from the first day she took the pills.

Keep taking them eventually you will be on the cycle according to the pills its just that for some it happens right away and for others it takes some time.