Since the gestational sac has stopped developing, it needs to be cleared immediately. It is not certain how long it can exist in the uterine cavity, sometimes it will be expelled within 1 week, but sometimes it will not be expelled after 2-3 months. Therefore, once it is determined that the gestational sac has stopped developing, it should be cleared in time, as a prolonged period of time may cause heavy bleeding or an infection in the uterine cavity, which can have a very serious impact on future pregnancies. If the gestational sac can be spontaneously expelled within 1 week and all the embryonic tissue is expelled, including the uterine meconium, it is called a complete abortion. If it does not pass down to the next level after 1 month, it is called an indolent or incomplete miscarriage.