Third visit. This is the first time we could actually make out something that looked like a baby. In the 2nd picture, you can see the head (on the right), some limb buds, and the spinal column. The heart is the little dark spot on the bottom picture (it's too tough to see on the top picture).

Second visit

This is the first picture of our new blob. We visited Strong Memorial Hospital's ultrasound lab and met with the sonographer and an high-risk OB named Lorelei. She was very frank with us about the risk imposed by the bloodclot, and that we would have to continue ultrasound visits to monitor the baby's progress.
The blob, at about 6.5 weeks, measured about 3mm.