I'm on the 9th day of my provera (medroxyprogesterone) medication and have been bleeding heavily when will it stop? why is this happening?

See your doctor: Any time someone has heavy bleeding due to medications, or not, they should be seen immediately by their doctor, who prescribed the medicine. In your case, it's provera (medroxyprogesterone). Let your physician discuss with you why it's happening. You want to make sure that your blood loss is not causing you to have anemia. Plus, they need to be aware, and document what is happening to you.