Is this normal or should I go to the ER? (Possibly miscarriage)

Faith

(Very TMI) So I am on the depo shot and have been for about two years and my period has been completely gone for one of those years but on the 7th I randomly started my period and it’s been extremely heavy I was bleeding straight out of the products I usually use and then this morning cramping woke me up and I pulled my pants to find this, I read everything on Google, the shape and color really freaked me out. It was about the size of my thumb.