Can Taking Meprate Be Safe To Get Periods?

i was prescribed meprate 10 mg for three days (morning-evening) to get my periods. i m not pregnant. A scan has already been done and pregnancy tests also were negative.today is the 5th day since i took the last dose of meprate but still no sign of withdrawal bleeding.there is some discharge though.how long do i have to wait before consulting the gynac again??