Too many NK cells

43 with 2 successful rounds (transferred 2 wonderful blastocysts each time), yet unsuccessful implanting. Clinic could give no explanation. We found someone who could - I have a high % of NK cells which means conceiving naturally would be a miracle! 😓 Wish I knew this before rounds of IVF then we could have taken a steroid at the time of implantation to help this procedure. Th