Crown rump length grown 5mm in 1 week, can measurements be off?
So I finally got to see my little bean last week, Wednesday night, measuring 4mm, so around 6 weeks 1 day gestation.
I had another scan this morning, crown rump length measuring 9mm, they put me at 6 weeks 5 days, so only 3 days off where I should be, and some websites say 9mm equates to 7 weeks gestation anyway.
My only worry is the crown rump length growing 5mm in nearly a week. Has anyone else had this happen? Can the measurements be off a couple of mm? I know the crown rump length is supposed to grow 1mm a day.
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