? about NK testing


Hello everyone… I just lost my pregnancy after my first FET. I was able to have a successful pregnancy with my first round of IVF. But I am curious about what testing that you can undergo to determine if immune issues are at fault? I have endometriosis and had surgery to remove it about 6 months before my IVF, so its possible that it is back since that was 3 years ago. But I read that 30% of women that have endo can also have a high number of NK cells. I am so scared of not doing some sort of testing and then wasting the last 4 embryos that we have. The bottomline is that we cannot afford to do another fresh cycle. Any support would be so appreciated!