Hi. I am 20 years old. I have recently noticed a pale yellow, odor free discharge. I went to my medical doctor and was checked for STD s and BV. All of my tests came back negative. I have low blood sugar and low iron. I have been taking Yaz birth control for a year. Along with the discharge, I experience cramps in my lower stomach throughout the month. There is a history of endometriosis in my family, but I m not sure if endometriosis causes a yellow discharge? I have no itching and no pain with urination.