Heya just to share i did amniocenthesis at 16wks. Cos i did nipt thrice - 2x Panorama and 1x Harmony. All no results, possibly Low Fetal count (1st panorama mine only 1.8% and 2nd 2.3% and doc says usually need 4-6%). I since went for the amniocentesis and everyting looked ok and i paid extra for some microdeletions tests. U might want to consider amniocentesis and this microdeletions tests as well, for peace of mine :)
Betty