Went for peeing but form urinary tract suddenly bleeding started and continued for few minutes without any pain or irritation. After that everything is normal no blood flow form next time.Normal urination is happening form next time. Menstrual cycle ended last week and no physical interaction happen and there is no cut or scratch in that area and blood was totally normal and no clot found. From where this blood came ? she is feeling very weak. Is it a serious problem? and what we have to do please explain...