Irregular Menstruation. Not yet know of.

I have been experiencing heavy and irregular menstruation for the past 1-2 years. After consulting my doctor, I was prescribed a contraceptive called Chelsea 35 ED (2mg cyproterone acetate + 35mcg ethynyloestradiol) to help ease the discomfort. I was also told that this would help with any other hormonal issues, as I also had a slightly high level of a male hormone. So the doctor believed this pill to be a fix-all. It has now been almost two months of continuous use of the pill and I am experiencing spotting after my period ends. This is both in the week after my period, and then again 10 days after the period has ended. I have been getting a dark discharge that resembles menstrual blood. I am worried about the continuous discharge, as well as whether the medication can have other adverse effects that I do not yet know of. Thank You for your help.