Google it: Why don't you go to www.Google.Com and type in 7 week fetus and then look under images. That will get you a lot farther than any description i can provide. On ultrasound at 7 weeks it looks like a shadowy grey tube with 4 little arm buds, a yolk sac and maybe one can see an amniotic sac as well.
Answered 8/9/2013
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3 doctors weighed in across 2 answers
A doctor has provided 1 answer
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