Pregnancy is usually preceded by leukorrhea and a relatively large amount of leukorrhea. When a fertilized egg is laid, the trophoblast cells in a woman’s body secrete human chorionic gonadotropin, causing the ovarian corpus luteum to enlarge further, which then becomes the corpus luteum of pregnancy. At this time, the corpus luteum secretes a large amount of estrogen and progesterone to support the fertilized egg’s implantation and development. Therefore, after pregnancy, due to hormonal influence, the water and blood in the cervix and vaginal wall will gradually increase, resulting in an increase in leucorrhea. In general, the change of leucorrhea before pregnancy is a normal physiological phenomenon, usually not accompanied by abnormal symptoms such as vulvar itching and odor, and no special treatment is needed. However, if you want to determine whether you are pregnant, it is still recommended to use early pregnancy test strips for self-testing, or you can go to the hospital for serum HCG testing to make a clear diagnosis. In addition, women need to pay attention to keep their vulva clean and hygienic, try to wear cotton, breathable underwear, and change them regularly to prevent bacterial growth and vaginal bacterial infection. If the leucorrhoea is yellowish, smelly or with vulvar itching, it may be an inflammatory vaginal infection and should be treated promptly at a hospital under the guidance of a doctor.