The reason for checking the leukorrhea at 37 weeks is to screen pregnant women for vaginitis, paying particular attention to the presence of group B hemolytic streptococcal infections, because group B hemolytic streptococcal infections may have serious effects on the fetus, such as causing intrauterine infections in the fetus, which may also manifest as fever, pneumonia, meningitis, etc. after the birth of the newborn, and even endanger the life of the newborn in severe cases. Therefore, a leuko-related test is recommended at 37 weeks of pregnancy to evaluate for the presence of group B hemolytic streptococcal infections and other vaginal inflammatory conditions. If group B hemolytic streptococcal infection is detected after the leuko test at 37 weeks, antibiotics can be applied as prescribed by the doctor. In addition, trichomonas vaginalis and mycotic vaginitis may affect the fetus, and once the infection is detected, it should be treated with medication, such as nifurtimox vaginal suppositories. You can use clean water to wash your vulva every day. If you find abnormal leucorrhea with itching, you should have a laboratory test and get active treatment.