Thanks for the query.
Possibly your doctor might have prescribed duphaston
after ruling out the pregnancy
After stopping the progesterone
pills sometimes it may take around one week to get the withdrawal bleeding.
So you wait for few more days.
If you do not get periods even after one week, consult gynecologist and go for one ultrasound
to rule out the pregnancy and also to find out the possible cause for delayed periods.
For more details you can ask me through: http://www.healthcaremagic.com/doctors/dr-sree-gouri-sr/63429