Also the uternie orientation and consistency are also evaluated to see the sustenance
of pregnancy.The sac should be seen when the
Human chorionic gonadotropin (hCG) is between 1,000 and 2,000 mIU/mL. Once identified, the sac diameter should grow by an average of 1 mm per day.
The second sign,yolk sac,which provides nourishment and produces the stem cells that develop into red blood cells, white blood cells, and platelets.