withdrawal bleeding is expected to occur usually within 3-4 days of completion of the treatment but it may take as long a week to happen. If you do not get a period even after that consult your doctor as you will need further evaluation. You may need a hormonal work up to see why your uterus
has not responded to a kick back. ( I presume you are unmarried) Please get further suggestions from your gynecologist. Wish you good health.