Pregnancy sac large buds small with fetal heart, generally does not cause fetal arrest, it is recommended to continue to observe, if the occurrence of fetal arrest, generally will cause abdominal pain, vaginal bleeding as well as weakening of the pregnancy response and other symptoms. 1. Abdominal pain: generally abdominal pain and lumbago and vaginal bleeding, once the infection is induced, it may also cause an increase in vaginal secretions, accompanied by a foul odor, which can seriously induce coagulation dysfunction. 2. Vaginal bleeding: some women will cause a small amount of vaginal bleeding after fetal termination, the rise in blood HCG value is not stable, or does not appear to double the growth, and at the same time, it will cause a low level of progesterone. 3. Weakening of pregnancy reaction: 6-8 weeks of pregnancy will cause early pregnancy reaction, once the fetus stops, early pregnancy reaction will gradually weaken. In addition, pregnant women are advised to undergo regular obstetric checkups during pregnancy.