Been there got the tshirt. Im so sorry, its the worst worst moment when the sonographer announces the high nt and even worse when the bloods come back not great. My story is this:
Angel baby: 5.4 NT - didn't get the bloods as also had cystic hygroma and hydrops, was told basically 0% chance of survival, i was very young. Repeat scan a week later showed hydrops and NT had increased, i had a tfmr. Postmortem showed no chromosomal disorder (for the main ones) but was told it could have been a rare one or an issue with the skeleton or organs which would have led to lifelong problems or not viable
DD: 3.6NT, papp a and hcg similar to yours, 1:13 chance of downs. Clear amnio, clear 20 week scan, absolutely neurotypical now (with a big head!)
DS: 3.4NT, normal papp a and hcg levels, 1:126 chance of downs. Clear amnio, growth slowed down at the end. Absolutely neurotypical from what i can tell (hes now 8 months). Big head.
I'll never know if i aborted my angel who would have been fine, it appears i just grow babies who have dodgy NT levels and hormones.
All i can say is you gotta wait for the CVS. Its an awful wait, you can't help what the outcome will be and after 6 mcs its so unfair that you are facing this. There are plenty of positive stories and also some negative outcomes, you wont know where you fall til the CVS is here but i give you the biggest handhold and hug and i hope beyond hope its positive for you xxxx