Reasons for a failed FET cycle your FS has provided with a PGD normal embryo?
Mitochondrial quality (too many mitochondria in embryo) can suggest abnormal embryo even if PGD is normal?
There is also a new Endometrial Receptivity test available to confirm correct transfer timeframe...
Beta integrin (lack there of) could also be a factor, corrected with Letrozole?
Lack of KIR? Addressed with Neupagen?
NK Cells or cytokines addressed withDexamethasone, intralipids..
Low E2 levels could be a factor for some (result in poor vascularisation).
Anti-beta2glycoproteins could attack embryo...