Just catching up on this thread. I was diagnosed as having NKC through a biopsy that was taken during a D&C / hydroscopy. My FS wanted to do a biopsy to cover off all testing before our first round with him (prior 3 rounds with different clinic / FS). I had it done at around day 23-24 I think! The biopsy was an operation so had to pay my excess with private health insurance, plus anesthetist plus FS costs - but worth it. We were diagnosed with NKC and are now being treated for it.
Plus you never know until you know - baby dust