Has anyone ever had a single vein umbilical cord??

I had one with DD, instead of 1 artery and 2 veins, I only had 1 artery and 1 vein.
It's linked to chromosomal abnormalities and IUGR.
DD suffered from severe IUGR, she was 4 weeks smaller than she should have been.
Born at 34 weeks she was only the size of a 30 weeker.
I'm going through DD's u/s reports (there's alot of them) and doing more and more research. I'm piecing alot of puzzle pieces together and realising why the doctors kept pushing the amnio. But they never explained any of this to us.

So, has anyone ever had any kind of umbilical cord abnormality?