Im bleeding and my period is not due until next month, i just finished a week ago. im worried, what could be the problem?

How much bleeding? If greater than 1 pad every 3-4 hours go to ER . May be stress. may be fibroids, polyps, endometriosis or if sexually active may be a miscarriage or pending miscarriage . Ultrasound will help diagnose. Check thyroid function. Get pelvic . Keep hydrated. F/u/ w/ MD/ ER/ urgent care ( if more than 1 pad every 3-4 hours go today)