If it is really heavy - a pad an hour, then this would be abnormal and you need to seek emergency treatment. This is rare and u/s are pretty accurate. Chances are you will see a slight decline in the bleeding over the next few days and it should stop completely within about a week. If it continues beyond that, this is another sign of a possible incomplete loss, and you should follow up with your Dr.
Has your Dr. scheduled a follow up? Or at the very least, bloodwork? Most Dr.