It is difficult to distinguish between pre-menstrual and pre-pregnancy leukorrhea, and there is no particularly significant difference. Generally, in the days around the onset of menstruation, vaginal discharge decreases compared to ovulation due to a sharp drop in hormone levels in the body. Vaginal discharge is influenced by the level of estrogen and progesterone in the body and changes with the menstrual cycle. After menstruation, the amount of leucorrhea decreases due to low hormone levels. Near ovulation, the leucorrhea can increase due to the increase in the body’s hormone levels, the proliferation of cervical glandular cells, the increase in the secretion of cervical mucus and the increase in vaginal exfoliated cells. Increased leucorrhea can also occur after pregnancy due to the continuous increase in estrogen and progesterone levels in the body. It is usually white or milky white, without odor and without itching symptoms. It is not accurate to determine the presence or absence of pregnancy by leucorrhea, which is not specific.