The phenomenon of leukorrhea usually lasts for about 3-4 days. It is due to the increase in the secretion of cervical mucus due to the rise in the level of estrogen during ovulation, and the secretion of progesterone after ovulation, which causes the endometrium to be in a secretory state, resulting in a large amount of colorless and transparent vaginal secretions that are thin and easily stretched. This kind of vaginal secretion has a moderate pH level, which is suitable for sperm activity and is conducive to sperm crossing the cervix into the uterine cavity and fallopian tubes and meeting the egg, so it is more conducive to conception. This is a normal physiological phenomenon and does not cause unpleasant symptoms such as vaginal itching and odor. The hormonal fluctuations during ovulation last only 2-3 days. After ovulation, estrogen and progesterone gradually return to normal, the cervical mucus and endometrium also return to their normal state, and the vaginal discharge also returns to normal.