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This will give you a more precise estimated due date.
If the screening tests find that your risk for any of the abnormalities tested for is high, you will be offered diagnostic tests such as CVS (chorionic villus sampling) and amniocentesis to find out for sure if there's a problem.The sonographer will check your baby's spine for any visible abnormalities.They will also look at the head, limbs, feet, heartbeat and check that the major organs are developing as they should.They will look at the placenta itself and will take note of its position, which may have implications for later in the pregnancy.A low-lying placenta usually moves up later in the pregnancy but if it doesn't, it can cause problems in labour so they will want to check its movements throughout your pregnancy.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.
He or she may need to prod your belly a bit to “encourage” the baby into a suitable position.
After a long first trimester, when you might well have had worries, or even wondered if there can really be a baby in there, it is a great comfort and a huge relief to see your baby on the screen and have the reassurance that everything is OK in there.
The results of the nuchal test are put together with the results of blood tests that are usually done a bit earlier to screen for the risk of your baby having conditions such as Down's, Edwards and Patau syndrome.
The “risk” will be expressed as a number, for example, one in 450.
The sonographer will tuck some tissues under your clothes so you don't get gel all over them.