I am 33 and have been having abnormal vaginal breakthrough bleeding. My OBGYN put me on progestin about a year ago because he suspected I was no longer ovulating (very long periods, lots of brown/black flow). I felt better while taking the progestin, however I had an unusual bleeding pattern (spotted at different times other than when I should have had the regular flow). So my Dr. put me on a very low dose BC pill, which I felt better on even than on the progestin, but I was still having breakthrough bleeding (light brown flow w/ black "chunks"). Since then, I have been on two other BC pills (the higher estrogen pills make me feel rotten), but am still having some breakthrough bleeding. My Dr. is obviously convinced it is a hormonal imbalance, but I am concerned that it might be something more. How long should I continue with this 'changing the BC route', and when should I say, "Hey, maybe we should run some tests or something?"