I am 17w4d pregnant and my baby is having abnormal movements on her ultrasound. Her arms are clenched at her sides and not moving around and her head keeps jerking backwards. She,also has a cystic hygroma. Through the Harmony test we,have ruled out Downs, Turners, and trisomy 13 and 18. Has anyone had experience with any of this, especially the abnormal movements on the ultrasound?