Normal leucorrhea after pregnancy should be white and pasty, without color changes. If the leucorrhea is yellow, it is a sign of inflammatory infection. If the leucorrhea is yellow and dilute, it is trichomonas vaginalis, if the leucorrhea is yellow and thick, like bean curd, it is mycosis vaginalis, it is best to determine the condition by doing a routine leucorrhea test. During pregnancy, it is important to pay attention to hygiene and washing, and to dry your underwear regularly or wash them with hot water. In serious cases, you can consult your obstetrician and take medication, such as intravaginal medication, which will not be absorbed through the whole body and is relatively safe.