After the scan the perinatologist came in and started another scan. I kinda figured something was wrong at this point because she appeared to be looking for something specific. I was right... she explained that we have a single umbilical artery (SUA), this can be a marker for quite a few other issues. The most serious of these conditions being Trisomy 18, which is not compatible with life. However, babies with Trisomy 18 usually have their hands balled up into fists and the nuchal fold would be enlarged (over 3 mm is considered abnormal). On the second scan we saw baby's hands wide open and waving at us, the nuchal fold was 1.8 mm. These were very good things and they are confident that our baby does not have this condition. We had a blood test and will know more when those come back next week.
A normal umbilical cord has 2 arteries and a vein, ours is missing one of the arteries. They explained that this occurs in about .5-1% of singleton pregnancies, 50% of babies with this condition are born completely healthy, 25% have heart or renal defects and the other 25% have negative outcomes. I truly believe in my heart that we will be in the healthy category, but just to be safe, we will have another high resolution ultrasound in 4 weeks. The doctor said that we will likely have an ultrasound monthly and regular monitoring towards the end of pregnancy to be sure that baby is getting adequate oxygen and nutrients. (Most SUA babies are a little on the small side at birth).
Sean tells me that I need to stay positive about this, and I think I am... I'm not as much a wreck as I thought I'd be. A lot of that has to do with having such good explanation from the doctor at the appointment, and a lot of it has to do with my gut feeling. I mentioned before that I just knew something was wrong... and while I was right, I also know that things will turn out for the best. We are strong enough to take on anything together, and we have the most wonderful families anyone could ask for.
I'll keep you all updated, until then... some pictures! (I think it's about time for some belly pictures, no? I'll do it soon.)
P.S. Doctor said she could see gender, I told her we didn't want to know... now Sean is all agitated that she knows and he doesn't;-)