Note: “6 weeks” counts from last-period-date, so it means as little as two weeks since conception, which is before many women realize they are pregnant

  • TheKMAP@lemmynsfw.com
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    7 months ago

    Oh that’s interesting. This was years ago but I thought the doctor I used guessed the age based on size/features seen in the scan.

    • admiralteal@kbin.social
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      7 months ago

      Fetal development is not really that consistent, to guess it down to a week or two based on physical appearance. Anything from 37 to 42 weeks is considered a “normal” pregnancy length. That means someone oversimplifying things could say any milestone might be +/- a couple of weeks. Edge cases might move the length of an otherwise-healthy pregnancy down or up an entire month.

      Even implantation isn’t that consistent. I’ve heard that sperm can linger for something like 5 days before implantation occurs. The whole middle-school health class version where the sperm swim up and race to the egg is kind of total nonsense.