How Can Ovarian Cysts Be Treated?

Hello, I have blood cyst in my ovary and have been advised meprate for 2 months by my doctor. I took the medicine for 13 days and i got my periods. The cycle of the medicine was for 25 days. But i got periods and the cycle got disturbed. I did not miss my medicine as that could be a reason for the periods but can t get the exact reason. Now i have started having the medicine again from the fifth day of my periods but the bleeding hasn t stopped even then. My query is first of all why did i get periods when i was having my medicine properly beforehand, secondly why isn t the bleeding stopping even after starting the medication all over again and lastly should i have meprate on the same time everyday? Thanks in advance