The NT scan at 12 weeks is really a personal choice - it used to be a test done in women over 30 but is becoming more of a routine ultrasound with it being offered to every pregnant women.
It is definitely not an US that you need to do, especially if you are aged under 30, have no family history of DS, etc.
I guess the main question to ask yourself: if you were told that you were high risk, would this make you feel differently about the pregnancy - and if your child was DS would you abort? If you are not prepared to abort - there is no reason to have the test.
I had the test with DS because I took it as a chance to see him and to make the pregnancy more real to us, we tried for 3 years to conceive and he was an IVF child. I wasn't going to have the NT scan done this time, (am 27) but have since found out we are having twins, and they "recommend" to have the scan done. So I will, but would not have an amino - regardless of results.
Don't feel pressured either way, and even if you have the scan - that doesn't mean that you HAVE to have further tests such as an amino if you are considered "high risk" this again will be your decision because the m/c rate is around 1-in-100 I think.
Goodluck with your decision - unfortunately as I said it is a personal one that only you and your DH can make.
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