minties
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- Nov 17, 2009
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According to https://www.baby2see.com/preconception/hcg.html doubling time for HCG levels between 1200 and 6000 is every 72 to 96 hours (scroll almost halfway down the page).
This page is also handy with lots of scan images:
https://www.baby2see.com/development/ultrasound_sonogram/first_trimester_scans.html#week4
This page is also handy with lots of scan images:
https://www.baby2see.com/development/ultrasound_sonogram/first_trimester_scans.html#week4