I recently passed about a 1/4 inch red piece of tissue when urinating, definitely from my ureter. It wasn't mucus, more like skin. 5 months ago I passed a lot of grayish mucous when urinating, went to doctor for UA and was told nothing on dipstick, but culture showed group B strep. I took 500 mg Pen VK qid for 10 days and was told no need for f/u. Could the red tissue be from Group B?