Yellow discharge during pregnancy may be caused by uncleanliness, vaginitis, cervicitis and other reasons. 1. unclean hygiene: after pregnancy, the blood HCG level rises, the body’s estrogen and progesterone levels will also rise, increased hormone levels stimulate leukorrhea secretion increases, usually do not pay attention to perineal hygiene, may cause yellowish secretion color. 2. Vaginitis: after pregnancy, women’s vaginal mucosa will be congested and edematous, vasodilatation, secretions will increase, stimulate the vaginal epithelial cell glycogen content increases, there are pathogens invasion may cause inflammation and infection, but also in the yellowish color of the secretion of the performance. 3. Cervicitis: after pregnancy, the body’s estrogen and progesterone levels continue to rise, estrogen and progesterone levels increase so that the entire columnar epithelium outward movement, may induce cervicitis attack, there will also be a yellowish discharge color performance. If yellow discharge is more frequent during pregnancy, it is recommended to seek timely medical treatment.