@Janefx40 I had a Nk biopsy which came back as normal, but waiting on a second one right now. I'm not sure what to think as the professor seemed sure there was something immune going on as I never implant. It makes me think: with all the other immune tests that exist that I could have something else could be going on.
By the way you can take progesterone for an extra week to hold off your period, just make sure you're prescribed enough.
@VenusStarr I had acupuncture in my last FET, I don't think it made any difference but some people feel really relaxed doing it. I still have some sessions left in the package so will probably go back. My acupuncturist also went away at a crucial point, right before the transfer, so I just had a couple of sessions leading up to it. He stuck a seed plaster thing on my ear and another on my wrist, one for nausea and one for anxiety.