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Looking for abnormalities isn't the purpose of this scan, though.That's the job of your next routine scan at about 20 weeks, when more detail can be seen as your baby grows bigger.Internal scans (transvaginal) are generally only performed in very early pregnancy.A dating scan is performed at your booking visit at 10-14 weeks of pregnancy.You may have calculated the length of your pregnancy from the first day of your last menstrual period (LMP).This is even though you don't actually conceive until 14 days after your LMP, or later than this if your cycle is longer than 28 days.You may be asked to come back for a further detailed scan and a discussion with a fetal medicine specialist.
You may need a second scan to check the first scan's findings.
In ultrasound scanning during pregnancy high frequency sound waves are used to make pictures of the inside of your body and your baby.
Ultrasound has been used in pregnancy for over 35 years and there is no evidence that it is harmful. There are many reasons: You will need to have a full bladder for scans less than 14 weeks, but not at later stages of pregnancy.
If you are concerned that your baby might have a problem like Down Syndrome, the scan can look for signs of this.
However, only 50-70% of babies with Down Syndrome are identified on ultrasound.