My g/f keeps peeing brownish redish discharge, with some skin colored tissue. It's been going on for 5 days now, and happens everytime she pee's. She feels no discomfort at all when she pee's. What could be causing this ? She has taken a blood test..And it came out negative for pregnancy, and also used an at home pregnancy test too, which came out negative as well. Her last period ended about 3/4 weeks ago, and the last time we had sex was at the beggining of this month. She took the at home test and blood test on eleventh..And we have no idea what this could be..Does anyone know what is causing this ?