I ve been having pains in my stomach, It throbs and feels like I at to much, even though it s been hours since eating, I ve had this for about a week. I take warfain and metformin. Then tonight after having normal sex I had brown colored blood in my urine. I have an appointment for Monday about the pain, just wondering if I should go to the ER, or wait. PS. It does not hurt when I urinate