Wow - I could have written many of these posts myself.

I have recently been asking myself the same questions after our 5th transfer. We had one pregnancy which resulted in a m/c and unfortunately I've not come close since.

I've recently sought answers from my FS looking for answers. He couldn't really give me anything except to suggest blood tests for clotting. I recently underwent blood tests for anti-thyroid (I thought the clotting was part of this but apparently not ) which came back fine.

The other things the FS mentioned were studies that looked into low dose asprin and high doses of folate which may help implantation, so that's something else you may wish to discuss.

BW has provided some good advice as you've already acknowledged. The only other thing, although it will have a cost, is trying accupuncture and traditional chinese medicine if you haven't already.

Wishing you all the best.