Okay good old me still has all the nuchal fold testing leaflets that I got when I had to go for mine.

it says

Sometime when you are between 10 and 20wks pregnant you may be offered some screening tests to check for abnormalities in your baby. The tests involved are a blood test and a ultrasound scan.

If you are between 10 and 14 wks pregnant the blood test and ultrasound can be used together to show if there is a greater than expected chance (an increased risk) that your baby might have Down Syndrome

If you are between 14 adn 20wks, the blood test can show if there is a greater than expected chance (an increased risk) that your baby might have Down Syndrome or a Neural Tube Defect.

If your screening test results show yoru baby is at increased risk of having Down Syndrome or a neural tube defect, only further tests will show whether or not this is so.

So I assume your doctor is only going to check via blood sample only which is done later in your pregnancy 14-20wks. I was told when I fell pregnant that combining it with an ultrasound at 12wks is only reasonably new (a combined u/sound and blood test wasn't offered to me when i was pregnant in 2001)

Hope this helps but I would seek another doctor if you aren't happy with the one you are with.

Love :smt049