nuchal fold measurements!

Hi, we had our anomaly scan at 21 +4. It revealed a nuchal fold measurement above 5 but less than 6. With one measurement at 6.1. The baby was very awkwardly positioned throughout head buried in my pelvis looking up with neck squashed slightly. We don't have a comparative measurement ftom 12 weeks as its not done at the hospital I attend. Has anyone experience of this? I'm so worried, I have a further detailed scan on Monday! So nervous.