What Should I Do When Brown Discharge Started On Day 12 After Taking Meprate Which Further Turned Into A Period?

Hi, I was prescribed meprate for 21 days by my gynaecologist. I consulted the doctor as I am suffering from frequent bleeding. On the 12 th day of taking medicine it started a brown discharge and it continued for seven days. On the 7 th day, it changed to normal period. What to do?. Kindly help