My periods are always late, but normally they last about 4 days. My period started August 4th, but it ended when I woke up on the 6th. I did not bleed the 6th, but starting the 7th I noticed extremly light ( about 1 drop) of dark brown blood. This happened for 2 days then stopped. Then today (the 11th) I noticed again the dark brown drop. I am confused.. any ideas what is going on?