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It's not completely foolproof – but the dating scan is a much more accurate way to work out how far you are into pregnancy than calculating it by the date of your last period, which is the only method the midwives will have used so far to work out your due date.You may find at this scan your due date is altered on your notes.
The pregnancy screening tests and scans you'll be offered vary slightly between different parts of the UK, so ask your midwife or GP what's available at the hospitals in your area.
It's more common to be told you're less far along than you thought you were, rather than that you're actually further along in the pregnancy.
You may also be offered a nuchal translucency test at this appointment.
The scan is primarily for dating but the sonographer will also look in on a few more things at the same time.
Here are the main checks they'll be making: Your baby will be measured and the exact stage of pregnancy will be calculated from the measurement made from crown to rump.