The good news: We had our follow-up appointment at the OB's office today to get the results of our first trimester screening bloodwork. Combined with our normal NT scan, our risk of Down's and other chromosomal abnormalities has been assessed as 1 in 37000. Seriously, 37000?!?! That's pretty damn low, and better than I could even have hoped for.
The gooder news: That whole freakout I had about the possibility of having a single uterine artery (with its accompanying risk of birth defects)? Totally unnecessary. I asked the nurse about it today and she looked through our file, and saw that our OB had recorded seeing 3 vessels (one vein, two arteries) in her u/s notes. If she hadn't seen the third vessel at all, it would have said "not visualized". So either she found it afterwards when reviewing the u/s photos, or she saw it at the time and didn't communicate it to us. Either way, another needless worry averted. We have a normal umbilical cord. Phew!
The prospect of us coming home with a real, honest-to-goodness baby in March is starting to feel more and more real!