Anatomy scan

I just had my anatomy scan on Monday and they called me said that they need to redo it. Should I be worried? My little one is stubborn as hell and will move every time the ultrasound comes around him so I don’t know if it’s just cause he moved around a lot or something different. When I was doing it the first time the lady was joking and talking to me not acting like anything was wrong. Just wondering if any other mamas went through having to do it again.