i just had a bowel movement and part of it was normal but it ended with a looonnnngggg stringy mucusy string. dark brown color...at first i thought it could have been a worm but it was mucusy in texture...help...i am worried...i am 50 yr old female; have not had a colonoscopy yet...take metamucil 2x a day...been on the wheat belly diet for 3 months now (no flour, less carbs and mostly eat meat, veggies, cheese, yogurt, nuts)