The fetal membranes consist of the chorion, amnion, yolk sac, and allantois. The chorion has three layers: cytotrophoblastic, chorionic connective tissue, and basement membrane. The chorion lies ...

"Although the gestational sac forms, it remains empty that means a baby is not created," shares ... However, these symptoms may start to fade as human chorionic gonadotropin (hCG) levels plateau ...