Jennie's third blood test to measure hCG came back with a value of 1817. It needed to double over the previous reading of 690 to be considered prego. She had an extra 437 to spare...
An ultrasound to count the number of yolk sacs (number of potential children) will occur the week of December 27th. That will be considered the week 7 ultrasound.
Re-read Daphne's 7 week ultrasound transcript.
A baby at 7 weeks looks like: