J.C.
My son had a 2VC and came out completely healthy. What it means is that there is supposed to be 1 vein/artery going in and 2 vein/arteries going out and the second one is collapsed. I would joke that I broke my baby's trash can.
There is alot of scary information out there regarding 2VC babies so I actually had my husband read the internet information and filter for me since I was too worried. In talking with the health professionals it appears that much of the research is out of date and plenty of 2VC babies are born without any trouble like my son. I had to get extra Level 2 sonograms and so that they could monitor his growth and so forth and a echocardiogram sonogram to check his heart but that was it. In addition they would not let me go past my due date, but I got some inducing massages and he came out right on time. I was even able to have the natural childbirth I wanted with hypnobirthing. They just kept an eye on his heart rate because of the 2VC.
Bottom line I hear there are plently of 2VC babies born healthy so I wish you the same blessings.