In the early stages of pregnancy, if a yellow discharge appears on the panties, it is considered to be caused by leukorrhea. The resistance of pregnant women and the vaginal environment change in the early stage of pregnancy, and the female genital tract is relatively short and open, which makes it easy to get vaginitis at this time. If the discharge is simply yellow and there is no vulvar itching or other discomfort, it is recommended to pay attention to hygiene, change underwear regularly and wash the vulva with water every day. If it is accompanied by vulvar itching and other uncomfortable symptoms, you need to do a white belt routine to determine the presence of vaginal inflammatory infections, which can be treated with medication.