Ah, Downs stuff.
I did terminate my first pregnancy due to it, but after CVS confirmed Downs. It wasn't just that though - we were told I was unlikely to make it to term due to the severity of the heart abnormalities, so for me, it felt like a choice between 'lose baby now' or 'lose baby later'.
I do actually think that's late for a NT scan, but it would be late for me, with already having history. If it falls within guidelines, they'll still be able to take the measurement.
For the sake of my mental health more than anything, I need to have an NT scan around 11 weeks. I did with my next pregnancy and DS was in the wrong position, so I had to wait around for a few hours and do a few jumps to try and move him. I don't think I'd have coped if I'd have had to come back for it on a different day.
I'm not looking forward to the screening this time because it just brings back awful memories, and I think I've already made up my mind that I don't want invasive testing (so no CVS or amnio) unless the NT is a risk. I was such a wreck with my pregnancy with DS that I had an amnio to confirm he was fine, but I trust enough in the screening to not go invasive this time. I think. Fully reserve the right to change my mind.