During pregnancy, due to the decline in resistance, the body is also weaker, estrogen and progesterone also rapid growth caused by the vaginal flora environment is out of order, if you do not pay attention to good personal hygiene, may cause abnormal leukorrhea. If there is no itching, odor, redness or swelling, daily washing of the vulva and daily changing of underwear can prevent it. However, if itching, odor or even redness occurs, you should go to the hospital and register with the obstetrics department for a leukorrhea test to determine which type of vaginitis the yellowing of the leukorrhea belongs to, and you can administer vaginal medication according to the results. It is not impossible to use medicines absolutely during pregnancy, it is possible to use medicines that have no effect on the fetus.