Hi! One the posters mentioned the higher dosages and she's right. When I've taken different pills, for example Ovcon-35, I had early bleeding and break through bleeding. My OB switched me to a higher dosage, Ovcon-50 and it helped with the issue. (the first time I was on it) In fact I'm now having problems with the Ovcon-50 and she is switching me to Ovral-28 because it still has the higher dose of estrogen but has a different progestin so may eleviate the bleeding. Gotta love it when your body doesn't like being forcefuly regulated.
Good luck, and don't be afraid/embarrassed to ask for what you want to fix otherwise you'll just have more/continued troubles.