That's right: At 3 weeks of pregnancy, the baby embryo is so small it's not recognizable as a baby. The embryo can be a few days to a week and a half old, at 3 weeks of pregnancy, depending on the woman's usual menstrual cycle length. That means if her stomach is big, she should look for another reason why.
Answered 2/1/2015
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Right!: The size of 3 weeks old embryo is about 4 mm.
Answered 8/26/2017
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