Please help! About 3 weeks ago, I went to the bathroom at work. While urinating, something small dropped from my vagina. It was like a tadpole but looked to me like very thick uterus lining, like what you d see on a very heavy period. Since then, I ve had nonstop mild dark brown spotting...not heavy but dark. I am on depo birth control and have been for three years. Could it be miscarriage, or some crazy hormonal imbalance from the birth control?..help!!:(