Bleeding not normal

I've been bleeding heavily for a week, when my period wasn't due but it's not like my normal period. I'm having really bad cramps and constantly tired and it doesn't seem to be stopping, I'm now getting worried because I don't know what's caused it. In the picture this is one of my lighter days when a pad would last me around 45 minutes other than that I'm changing it around every 20?! ANY HELP😫