I had an ultrasound today for the Nuchal screening. The tech had a lot of trouble getting the baby to move its head so she could get images of the fluid. The ones she did get measurer 1.8mm which from what I am reading is below average. The baby did measure 13 w 4 d and I am technically 12 w 5 d. I won't know the officicial results until the end of next week. Should I be concerned that the measurement was low on the fluid and that the baby was measuring big?