AF question! (TMI pic in comments!Warning)

Ok ladies for as long as I can remember my period has Always been 1 day of light red/pink blood, 1 day heavy dark red blood, 1 day dark dark almost brow blood and 1 day of brown blood spotting. AF wasnt due til Saturday but today I went to the bathroom this morning and had Bright Red blood pretty heavy. I freaked out and put on a pad. When I checked it a few hours later there was nothing on it and when I wiped there was a little dark brown blood. So now when I went to the bathroom there was bright red and brown blood! (Pic in comments) any ideas?!?!?! Could it be stress?