Well, 3 weeks ago i decided to start birth control. I got my period the next week. It lasted for about a week, then stopped for a day, and after i started spotting. At first it was red and light, but then it because a little heavier and really dark. Currently i am still spotting lightly but it is a very dark brown and it won't stop and I am so annoyed by it, and a little bit worried. I did have sex after the first week of being on the pill, but it was a day or two before my period. Anything ?