NT measurements?

Hey guys, I’m not looking for medical advice as I have already been referred to fetal medicine for an in depth scan. I was just wondering if anyone has any similar experiences with this. I had my first trimester screenings and evening came back as low risk - both the blood test and the NT measurements from the scan. Yesterday I went for my repeat anatomy scan as baby always seems to be in awkward positions so we struggled to see everything the first time. The lady told me that he has extra fluid around his neck and notes the NT measurement on my referral as 6.96mm. At 12 weeks was 1.3mm as everything seemed normal. I know it could be a positional issue and hoping for the best. If anyone has any similar experiences I’d love to hear them. Thank you x