By Krissi Danielsson, About.com Guide
About.com Health's Disease and Condition content is reviewed by the Medical Review Board
Image of a Gestational Sac in Early Pregnancy
Photo © A.D.A.M.A structure that develops in the uterus early in pregnancy, enclosing the developing baby and amniotic fluid.
In an ultrasound, the gestational sac should be visible by five weeks of pregnancy. Measurement of the gestational sac diameter (GS) should increase by about 1 mm per day in early pregnancy.
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