They are usually visible as multiple embryos or gestational sacs.
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By 8 weeks the embryo is readily seen on abdominal scan.
At 7 weeks, your baby should be about 5 to 9 millimeters mm in size and the gestational sac will be about 18 to 24 mm.
By my 12 weeks dating scan bean was bang on target of 12 wks 3days.
Last medically reviewed on October 30, 2020.