Hi.. Have Taken Primolut For 9 Days ( 1-3 Days

Hi.. have taken primolut for 9 days ( 1-3 days 3 per day, next 3 days 2 per day and last 3 days 1 per day). Bleeding started in the last day of taking tablets. There was a heavy pain for 4 days and bleeding was not very heavy (3 pads per day) . Scan showed that my endometrium thickness was 16 mm before taking primolut. Bleeding has stopped after 6 days. Is this a normal way of stoppage or should I consult the doctor immediately?