Dating pregnancy by ultrasound?

when is it best to date a pregnancy.

what is more accurate at 7 weeks or 12 weeks?

at the emergency scan at 7plus weeks they didnt date me till my actual dating scan , it was just to see a heartbeat. is it because they can see the crl better at 12 weeks to measure?

thanks just wondering! the best time to date pregnancy and give due dates.

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The earlier the scan the more accurate the date. They didn't do a dating scan because when you have an emergency scan they aren't doing anything other than check the viability )heartbeat). A dating scan at 12 weeks should still be early enough to give a relatively accurate date within about 2 weeks in either direction.

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i was told by the woman who did my ultrasounds that the dates were very exact but that wasn't the case in my experience my baby was born 15 days before his due date and once born and examined was thought to be at a week or so late.
7... earlier the better cause the further along you are, the baby takes on their own growth pattern but they are all the same up til 10 weeks usually so before then is most accurate
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