The gestational sac can sometimes be visualized as early as four and a half weeks of gestation (approximately two and a half weeks after ovulation) and the yolk sac at about five weeks gestation. The embryo can be observed and measured by about five and a half weeks. The heartbeat may be seen as early as 6 weeks, and is usually visible by 7 weeks gestation
http://en.wikipedia.org/wiki/Obstetric_ultrasonography
(for the Wiki-wiki-wikipedia reference, it's from this video: Some Grey Bloke)
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