The embryo will stop developing about 2 days after taking mifepristone. In the clinic mifepristone is mainly used to terminate early pregnancy, such as early pregnancy between 5-7 weeks of pregnancy, you can take mifepristone combined with misoprostol orally to terminate the pregnancy, mifepristone will kill the embryo after taking it, and misoprostol will cause uterine contractions to expel the embryo that has already died, so as to achieve the purpose of termination of pregnancy, but it is not 100%. Between 5-7 weeks of pregnancy, taking mifepristone can cause the death of the embryo, and in some cases, even though the mifepristone is taken in the right dosage, there is no way to cause the death of the embryo, and the embryo still survives and grows and develops, so this should be especially noted.