"To my baby angel, You did flips in my belly, I heard your heart beat, I saw you grow for...
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Gestational Sac
One of the first signs of pregnancy to show up on ultrasound is the gestational sac, the sac which encloses the developing baby and contains amniotic fluid. The gestational sac is found in the uterus and on an ultrasound, it appears as a white rim around a clear center.
Source: https://www.verywellfamily.com/gestational-sac-2371621