question: Hello doctor,I am a 33-year-old woman. I am pregnant with my first baby in my 12 weeks. I had an appointment with my doctor two days ago, and she did an ultrasound to me, and she told me that th NT measure of the back neck of my fetus is 2.3 mm. She asked me to do a blood test called prenatest to be sure of that. Please advice what should I do? I am attaching the ultrasound report.