Bleeding from the fluid dark area of the gestational sac is usually caused by pre-miscarriage or embryonic dysplasia. 1. Pre-eclampsia: in early pregnancy due to the unstable development of the embryo, when the corpus luteum is not functioning, it will lead to low levels of progesterone, which will cause capillary rupture caused by the stripping of the gestational sac and the uterine wall, which can be manifested as liquid dark area bleeding around the gestational sac, which can be combined with ultrasonography, progesterone test to assist in the diagnosis. 2. Embryonic dysplasia: when embryonic dysplasia can also cause liquid dark area bleeding around the gestational sac, or even cause fetal arrest, combined with ultrasound examination suggests that the size of the gestational sac and menopausal gestational weeks, blood HCG levels can assist in the diagnosis. When the ultrasound examination indicates that there is bleeding in the fluid dark area around the gestational sac, it is necessary to consult the doctor in time to find out the cause and actively deal with it.