What causes an empty pregnancy sac?

Empty pregnancy sac refers to the absence of yolk sac in pregnancy sac, indicating poor embryo development, mainly related to poor sperm or egg quality, chromosome abnormality, insufficient endocrine function of placenta, virus infection and other factors, or pregnant women contact external adverse factors, contact with chemical components, drugs, etc., can also cause empty pregnancy sac performance. Under normal circumstances, 60 days of pregnancy, no embryo bud fetal heart, basically can be counted as empty sac, and, need to pay attention to is, women in the early stages of pregnancy, even if progesterone values and chorionic gonadotropin values are within the normal range, there is still the possibility of empty gestational sac.