NT Ultrasound experience

Shivi
Moms to be I have my NT ultrasound on 10 th August . It will be my 12.1 week . Can you please share your NT ultrasound experience with me. I want to know what is different in NT then the usual ultrasound . What other info do we gather from this one and do we know the baby sex through this one?  Thanx for sharing in advance .