I know this is resurrecting a month-old thread, but I was looking for info on ultrasounds, and had to respond here:
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Originally Posted by Charles Baudelaire
As you probably know, an embryo can take up to six days or sometimes more to implant in the uterus and start making HCG and a placenta, which is really when pregnancy officially "begins." Therefore, you might have done the happy dance on the 1st, but your blast didn't implant until the 6th, so your due date estimate would be nearly a week off. Early US dating, though, can establish exactly how old it is, down to the day.
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Actually, US dating would be measuring the growth of the embryo/fetus, which begins at the moment the fertilized egg starts to split; this happens prior to implantantation. However, it is possible for the sperm to live for a while before the egg is released, so it is conceivable (so to speak

) to have sex on the 1st of the month and not actually have a fertilized egg in you until the 6th.
So yeah, your overall point about "knowing" the due date and the actual due date is well taken.

I have had an early US with both my pregnancies...neither time was totally "necessary" but at least this way they know the actual due date and won't start bugging me when they believe the baby to be overdue. However, one rationale which I haven't seen mentioned here, for routine and even multiple ultrasounds, is simply money.
The small-town OB practice I'm currently going to has a 3D/4D machine, and they seem reaaaaally happy to suggest an US, seemingly at the drop of a hat. I was commenting on this to someone, and they said, "Well, yeah, they have to pay for that multi-million dollar machine!" And even if a practice has an older, paid-for machine, the insurance companies are still going to give them money for each scan that they do.
I'm not saying there aren't legitimate reasons for early and routine US...just that some providers have motivations beyond the diagnosis of potential health problems. It's good to keep this in mind when making your own health care and pregnancy decisions.
