Is It Normal To Have Prolonged Light, Brown-colored Bleeding After Taking Meprate, Femilion, And Estrodial?

I am unmarried and 28 year old. I have irregular periods problem. I had consulted so many doctors in last 5 years. From novmember my doctor prescribed meprate for 5 days and after completion meprate i got periods and in 2nd day of my mens i took femilion for 21 days. But after completion of femilion there iwas no periods. Then doctors suggested estrodial tablet snd meprate for 21 days. January 8 i got my periods and till date bleeding is going on. Bleeding is very lighter not normal and also in brown colour clot. Today again i went to consult doctors and she suggestef novelon. So i am little bit confused about medicine. Kindly help me