Maternal Fetal Med Ultrasound

Has anyone been referred to a Maternal Fetal Medicine Doctor for an ultrasound? During my anatomy scan at 20 weeks they were not able to get all the measurements they needed as baby was very stubborn and wouldn’t move. I went back again yesterday at 22 weeks to try again and she still was as stubborn as can be so now they are referring me to the maternal fetal medicine doctor. It made me nervous at first that there was something wrong but the doctor said no. Anyone else experience this?