How long will cramping and bleeding last if you're having a miscarriage
It will depend on how far along you are, but expect a couple hours or more of heavy bleeding. Be very aware if you are getting woozy and light headed or faint because that could be a sign of excessive blood loss. Unless you've been through heavy bleeding before, you really should go to the ER or call 911.
Once your miscarriage is complete, bleeding could last from a few days to a few weeks if you do not have a d & c done.
After I passed the baby the cramping stopped almost immediately. I bled for a few days after that, like a normal period. I was told to go in if the bleeding soaked a pad in an hour or less or if I got light headed.