The most common clinical cause of yellowish underwear in early pregnancy is an inflammatory reaction in the vagina, or a local inflammatory reaction in the cervix, which can also lead to yellowish discharge. It is advisable to take a swab of the discharge for a routine white belt test. If pathogenic bacteria are found in the white belt, anti-inflammatory treatment should be given according to the results, and it is also advisable to keep the vulva clean and change underwear regularly so that the yellowish discharge will disappear soon. If no pathogenic bacteria are found after routine leucorrhea tests, it is recommended to gently open the vagina with a speculum to find out if the cervix is congested, edematous and other inflammatory reactions. If there is local inflammation of the cervix, it is recommended to take oral broad-spectrum antibiotics, such as cefuroxime for about 5 days, and then find out if the color of the vaginal discharge has changed to normal.