I'm very happy to say everything went very well with the Nubbin. Carl brought along Sophia and she was good throughout the ultrasound, mainly because she was eating.
Nubbin measured ahead (as compared to a dating u/s at 6wk4days) and came out about 13weeks, which is much like big sis who after her dating u/s at 5wk6days measured a week ahead at the NT scan and then 2 weeks at the 20week u/s.
The baby had HR of 170 which is the exact same as big sis throughout my pg. Nubbin was very well behaved for this ultrasound unlike big sister who was never facing right.