Nope. The tech at the NT scan (at almost 13 weeks) said he'd look and see if he could make an educated guess but wasn't able to tell anything because it was just too early. The bloodwork for the second part of the screen (16 weeks for me) only looks at the amount of various proteins in your blood to give an estimated risk of various issues. I didn't find out the sex of my baby until 20 weeks at the anatomy scan.
Re: Sequential screening