What causes a female to bleed uncontrollable for a month straight with no chance of being pregnant?

Biopsy. There are many reasons for extended uterine bleeding. One thing that your doctor needs to check are your various hormone levels. It may also be time to have an endometrial biopsy to rule out endometrial hyperplasia or a uterine cancer. Please make an appointment with your ob/gyn.
See a doc ASAP. There are several possibilities, but you need to seek qualified medical care asap.