Gestational sac: If you had an ultrasound with only a gestational sac, it could be either a very early pregnancy or what is called a missed abortion. If you are only 4-6 weeks you may not see a fetus, but if you are further along like 10 weeks it may be a missed abortion. That term simply means a pregnancy where there is no fetus and just placenta tissue.
Answered 9/22/2012
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