Hi Kellxx,
It is really your choice if you want to have a 12 -13 week ultrasound. Some women find it reassuring and that is important for them and other women don't need/want it. Often a 12 week scan is done as at this time it is a good indicator that your dates are equal to the babies growth so that there is no descrepancy. This may be important should you go 'overdue'. But, if you are quite sure of dates than this probably isn't important.
The Nuchal Translucency Ultrasound is now done in conjunction with blood tests to give a risk factor for chromosomal disorders. However all ultrasoundographers measure the nuchal fold at a 12 - 13 week scan as a routine thing. The full NT ultrasound though does require the blood work as well to give a full picture.

I would suggest you talk to your care provider and ask what they think and then you can decide what you would feel most comfortable doing.

I wish you lots of healthy happy baby vibes - we're both due at the same time!!
Love Deb