The gestational sac that comes out of miscarriage is blister-like, smooth on one side and rougher on the other side. Below the smooth one mask-like tissue is water-like tissue matter, which is the early amniotic fluid, and the rougher one on the other side is the later placental tissue, which is similar to villi-like tissue, and if floating on water, you will see villi-like tissue oscillating, which is what the gestational sac looks like. If the miscarriage has been complete, clinically the vaginal bleeding will decrease significantly and the lower abdominal pain will disappear. If there is more vaginal bleeding and the blood is bright red, this is often a possibility of incomplete miscarriage. It is recommended to have a clinical examination as soon as possible. Ultrasound examination can be performed to find out if there is any residual tissue in the uterus, and if necessary, to perform an operation to remove the uterus.