The straining of the leucorrhea during ovulation is mainly due to changes in hormone levels in the body, which make the mucus of the cervix thinner. In this case, the leucorrhea is transparent and resembles egg white and is particularly well stretched. This leucorrhea plays a decisive role for the sperm to penetrate the cervix and enter the uterine cavity, facilitating the passage of sperm. If the leucorrhea does not change and is as sticky as before, it is not conducive to the sperm to pass through the mucus and enter the uterine cavity. Therefore, the change in the leucorrhea during ovulation is mainly to facilitate the passage of sperm to achieve pregnancy. During ovulation, the leucorrhea is relatively high and it is recommended to keep the vulva clean. For this kind of leucorrhea that appears like pulling silk, the clinic can choose to have intercourse at this time and it will improve the chances of pregnancy. If the leucorrhea does not appear, it does not mean that ovulation is not occurring. Ultrasound can be used to monitor the maturation, growth and development of the follicles and their discharge.