First - which genetics lab did you use for your PGS? Ours didn't recommend an amnio. You're probably right it could be for liability reasons but the lawyer in me also finds it strange that they'd recommend something which in itself carries risk (so swapping one form of liability for another).
I had my weekly scan today and am measuring 4 days ahead (14w1d) with a HB of 156. All looked good so I will be back there in 10 days for the next one. Was nice seeing the little guy again although he was not cooperative with getting a good pic.
Natera. I think they're in California. Which one did you use?