Thanks @2021ivfagain. The sperm dash worked out ok in the end, so whilst it would have reduced the stress if we'd had the frozen sample as back up, I'm glad we were able to use fresh. It does also make me think that the advice to abstain for 2-5 days seems outdated, particularly when using ICSI. We've never had a DNA fragmentation test, but I've sometimes wondered about it, and a shorter abstinence period is meant to help with that. The second sample was 99% motile.
We need more embryos than average because of the two variables of PGS and PGD. There is a risk that none of our euploid embryos pass PGD, but that the aneuploid ones do. In this scenario, no embryos would be usable. It is brutal.
We've done pretty much everything! ERA, ALICE and EMMA ahead of the first transfer - no issues found. Hysteroscopy ahead of the second - again, no issues. Steroids and IVIG ahead of the third. All I've had to show for it are two chemicals (one super early, one slightly later), and one total fail.
I was prepared to give up, but I had a consultation with Professor Quenby, who concluded that in her view we'd been very unlucky and there was no reason why a future transfer wouldn't work. However, we're going to try natural or natural modified this time, instead of medicated - try to mimic natural conception as far as possible. Also I've not been a good responder to synthetic progesterone.