White discharge in the ninth month of pregnancy may be caused by the following factors: 1. The level of estrogen and progesterone in the body of pregnant women will rise in late pregnancy, and the glands in the vagina will secrete vigorously, so pregnant women will have increased white discharge. Pregnant women should take metronidazole for treatment under the guidance of a doctor and remember not to have intercourse to avoid aggravating the infection. 3. If a pregnant woman has mycotic infection or trichomonas vaginitis in late pregnancy, she will have symptoms such as increased white discharge and vaginal itching. It is recommended to have a routine examination of the white discharge in late pregnancy and then treat the symptoms.