Southampton dating scan
You may need to have a full bladder for this scan, as this makes the ultrasound image clearer.
You can ask your midwife or doctor before the scan if this is the case. Find out more about what happens during a pregnancy ultrasound scan.
The screening test for Down's syndrome used at this stage of pregnancy is called the "combined test".
The sonographer will put some gel on your tummy and move a small hand-held device (transducer) over your skin to get views of your baby.
However, conception doesn't actually occur until around 14 days after your LMP, or later if your cycle is longer than 28 days. Multiple pregnancy: antenatal care for twin and triplet pregnancies CG129.
You may know when your LMP was, but not when you actually conceived.
This test is not quite as accurate as the combined test.
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