Yellowish and sticky leucorrhea before your period is not necessarily a sign of pregnancy. Although some pregnant women do experience increased leucorrhea before pregnancy, the phenomenon of increased leucorrhea is not specific to pregnancy and cannot be used as an indicator to determine pregnancy. If a woman who usually has regular periods and has a normal sexual life has a significant delay in her periods, with a delay of 3-5 days, she needs to be tested first to see if she is pregnant. The yellow leucorrhea suggests that there may be vaginal inflammation, which is related to bacterial infection or lack of hygiene. It is recommended to pay attention to perineal hygiene first, and if there is vulvar or vaginal itching, you need to go to the hospital for a gynecological examination and take the secretion for testing and treatment.