How long does it take for the gestational sac to form?
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The gestational sac is usually the first sign of pregnancy on ultrasound and may be seen as early as 3 weeks. At this time the average diameter of the sac is 2 to 3 millimeters. At around 5.5 weeks the yolk sac often becomes visible inside the gestational sac.
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The gestational sac is usually the first sign of pregnancy on ultrasound and may be seen as early as 3 weeks.
At this time the average diameter of the sac is 2 to 3 millimeters. At around 5.5 weeks the yolk sac often becomes visible inside the gestational sac.
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