Question about NT test!?

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My obgyn put in an order for me to do the NT Scan and blood work. They made my appointment for my 12 weeks mark. I have been reading a lot about woman finding out gender from the blood work a week later. Is that for the test I am doing? I didn't know this when the appointment was made so I didn't get the chance to ask my obgyn. Thanks in advance Ladies 😊