In the past month I ve had slight cramps every once in a while, white discharge every day that would range from smooth, watery to thick and stretchy. The discharge was occasionally a very light yellow and sometimes stretchy. My last period started October 31st. My next period started a day late on November 29th and this whole week my discharge has been dark brown almost black with only extremely small drops of blood. I have had old blood before, but this is different. There is no blood on my fingers when i try to smooth it around, it is just dark brown/black. I am on birth control and have been somewhat stressed out, but I ve also had unprotected sex a lot this month. Ive taken 2 pregnancy tests this week (on Sunday and Wednesday) and both were negative. Should I go to the doctor? Is this something I should be concerned about?