I am 24 years old and I just starting taking Loestin 24 three wee...

I am 24 years old and I just starting taking Loestin 24 three weeks ago today. I have PCOD (polycytis ovary disease) which stops me from having my period for months at a time, December was the last time I had my period. I have never taken any type of birth control pill until now. The doctor put me on provera pills to get steady progestrone in my body, I couldnt take it. I had severe headaches, to the point that I thought my head weighed 1000 pounds. She took me off that and put me on Loestrin 24. I was fine the first two weeks,a slight migraine but no other sides effects. On Wednesday morning I starting spotting, but by the afternoon it was a full flow, with severe cramps. It is now Sunday and I am still bleeding and still cramping very bad. She told me that it will take 3 months for the side effects to go away, but I dont know what I should do? Should I stick it out the 3 months being that it has been so long since I had my period? Should I call the doctor and see if I should stop taking the pills and go on something else? I appreciate the advice.