Southampton dating scan
This test is not quite as accurate as the combined test.
The dating scan will also show if you're expecting twins, triplets, or more.
It's helpful to know about twins early on, and it's easier to see whether or not they share a placenta during the first trimester.
All pregnant women in England are offered an ultrasound scan at around 8 to 14 weeks of pregnancy. It's used to see how far along in your pregnancy you are and check your baby's development.
Your midwife or doctor will book you a dating scan appointment.
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.
Find out more about the combined screening test for Down's syndrome.It shouldn't be uncomfortable, and you don't need a full bladder Your sonographer will give you a report of the scan, which will tell you exactly how many weeks pregnant you are.