I have been bleeding for 11 days while on birth control pills and its been super heavy and painful ?

Dr. or ER can check: Heavy and prolonged menstrual bleeding may need medication to stop it, to avoid too much blood loss. One's primary care doctor can help. An exam is usually needed, but if a teen has no risk of sexually transmitted diseases, then an internal vaginal exam may not be necessary. Sometimes, one's doctor will refer to an Ob-Gyn doctor to evaluate for medication (pills) treatment.