When a woman is 4 months pregnant and has leucorrhea with yellowish color, she should consider the following reasons: a. It may be due to dampness and heat in the body, resulting in increased leucorrhea secretion and yellowish color, but at this time there is often no vulvar itching, or obvious vulvar odor. The specific type of vaginitis can be diagnosed through routine examination of the leukorrhea, mainly due to the dysbiosis of the vaginal flora after pregnancy. The main cause of cervicitis is hormonal stimulation after pregnancy, which can aggravate the inflammation, and that’s why the leucorrhea and yellowing symptoms appear.