Hey there babygirl1982, can't private message you so thought I'd answer here...
Did you have the chance to read over the thread?
Seems that most of the umbilical cord cysts detected on U/S in first trimester resolve by second trimester, and the babies followed up at birth that had these were all fine! However, there is a small subset of the cysts that don't resolve by second trimester, and it is these babies who are at risk of chromosomal problems, mainly trisomy 18 (much worse than Down syndrome, which is trisomy 21). Personally, DH and I didn't want to wait to see if it would resolve, and we opted to have CVS to look at the baby's chromosomes at 12 weeks. Everything was fine, and the cyst resolve by the next ultrasound (and this is what happens to the MAJORITY of them!).
How many weeks will you be when you see the consultant?
The odds are on your side that everything will turn out fine, it is just a small subset of the cysts that are of concern!
Hope this helps a bit!