The hardest thing I'm having trouble to digest is this label of 'unexplained infertility'. I think it's BS tbh. Of course the embryo may not have been mature enough/ had defects, but I think that's just an 'unexplained' diagnosis attached to any failed cycle. I believe Infertility is a symptom not a diagnosis. I also think my problem is with implantation but don't know why or what is causing the problem.
Stumbled across testing for 'NK cells' and a 'hidden c test' whilst googling the odds of getting a BFP > 10dp3dt BFN. Interesting reading.
Sorry if I'm being very negative, but I think it's better I stay grounded now than let my heart rule my head.
Good luck for your next cycle trying4. x