pregnant or no?

period or implantation? period isn’t due for 4 days. also have pretty bad cramping, blood is also brighter than this as well. on & off bleeding like i said varies from a VERY bright red to this color and is also dark lol. it’s like three different shades every time i wipe but its not enough to go on a pad. i only see this when i wipe. so wonder if period is starting