In the early stages of pregnancy, the main tissues in the uterine cavity are the gestational sac and the meconium. The meconium is the embryonic tissue that appears after the pregnancy and will form part of the embryo along with the gestational sac. When a woman has a medical abortion, the gestational sac can be discharged as a whole, while the mucosa needs to be discharged gradually, so after a medical abortion, the vaginal bleeding usually clears up in about 7 days, during which the mucosa will gradually be discharged from the uterine wall. If the mucosa is not discharged cleanly and completely, it may cause residual uterine cavity, and after the residual uterine cavity, vaginal bleeding will continue, and the bleeding will last for a long time, and it is easy to bleed and become anemic or infected.