I noticed several of you commented that I may want a different doctor. I am definitely considering it, but not really much at the moment because I don't want to visit another doctor in the next month. I called the doctor's office yesterday to get the measurement of the baby and yolk sac. This is what I learned.
Crown to Rump Length - 6w1d - they didn't have the actual measurement in my record, but I'm pretty sure I saw .52 on the screen when the tech did it. (this aggravates me of course, another reason I may want another doctor)
Yolk Sac - 7.3mm. Anything over 6.0 mm is considered a poor prognosis by doctors. I didn't understand why this was the case until just now. I finally read that abnormally large yolk sacs results from accumulation of nutrients not used by the embryo.
Heartbeat - 77 beats per minute ... which is below normal.