The empty sac of pregnancy can be observed first, more than 8 weeks of pregnancy does not appear buds, fetal heart suggests that the embryo is in diastasis, should be promptly removed. Normal early pregnancy in 6 to 8 weeks should be able to see the fetal buds fetal heart, if more than 8 weeks have not appeared fetal buds fetal heart, only the empty gestational sac, considering the embryo inactivation. The gestational sac is a sac-like structure formed by the combination of sperm and egg to form a fertilized egg, the cells continue to divide and form a sac-like structure, with the increase in gestational weeks, it will gradually differentiate into a yolk sac, buds, fetal heart, which is a live fetus in the uterus, and it can continue to continue the pregnancy. Embryonic arrest occurs, if you can not naturally discharge the intrauterine residual tissue, a long time easy to cause infection, coagulation dysfunction, it is recommended to go to the hospital in a timely manner to clear the uterus. After pregnancy, you should do a good job of pregnancy and obstetric examination, there are abnormalities in a timely manner.