@brandosmommy, they CAN see through ultrasound, it has something to do with the neck, they look at 20 weeks and they also do blood work at that time too
usually between 15 and 20 weeks they do a quad screen to check for down syndrome as well as a bunch of other genetic testing for other things that may be prevalent in your family
Through a ultra sound they found too much liquid in her neck bringing up reason for concern. And they said they won't know for sure unless I did the CVS procedure which gives a more accurate answer then blood work or ultrasound cause they are testing the babies actually DNA