I was passing clots the size of toy cars yesterday while at the hospital and we needed to get that to stop before they would let me go home. Before I left they said if I get any more clots or bleeding to lay down and massage the uterus again. I'd be able to feel if its hard or feel it go hard under my fingers.

Give that a go and see if that helps the bleeding - but if not I'd go see your doctor for advice.