NT = nuchal translucency. It's the trisomy testing (for Down's, Edward's and Patel's syndromes). You also get blood testing done, but that's for things like STDs and whatnot.

So long as the CM doesn't smell, I was told it's all well and good, just the mucus plug formation. Bit worrying how much mucus this plug has already dropped out, let alone made LOL.