I started taking ortho tri-cyclen birth control--it's low dose hormones--and I started my period the same day I started taking it. My period was normal, heavy then light, but it didn't stop. I think it was the end of the first week, or maybe second, black/brown blood started, then stopped. Then my period started again the next day and hasn't stopped. One day I had blood clots, but not many. I stopped taking the pills thinking my period would stop, but it hasn't. What should I do? And is this normal when starting birth control for the first time? I'm 15.