What are the effects and methods of using mugwort to warm the uterus in preparation for pregnancy? 1. Introduction to the effects of mugwort: mugwort, also known as mugwort leaves, is a common Chinese herbal medicine that has the effects of warming the menstruation and dispersing cold, promoting blood circulation and removing blood stasis. During the pregnancy preparation stage, mugwort can play a role in warming the uterus and help regulate women’s fertility.