Hi @Mouseorchestra7 - ugh number of transfers for us was a bit of a disaster in that obviously they started with the "best" ones but for us the worst ones worked! So we had to go through a lot of expense and suspense to get there.
Round 1 (36) - 4 blasts, 2nd transfer worked. Don't remember but none were amazing grades probably mostly BBs
2021 (38) - transferred 2 remaining blasts from round 1 - bfn and a chemical.
Round 2 - 6 blasts, all BB but we also did caremaps and had from 8/10 down to 2/10. First 3 transfers failed, so we went to round 3 and decided to do pgt a to try and find out what the problem was.
Round 3, 4 blasts, best grades of all, ABs and 2 9/10 on caremaps. All were abnormal on PGT A 😩
So we transferred 2 of the 3 we had left from round 2, both BB and only 4/10 and 5/10 on caremaps. One barely survived the thaw. Both have stuck (for now).
Morals of the story from my point of view are: don't get hung up on grades, transfer what you have before collecting more (would have saved us a lot!) and I think really that having numbers gives you more chances as lots just don't work as you get older - i have had 3 stick from a total of 13 either transferred or PGT tested and destroyed, and I don't think that's particularly surprising. It's possible some euploid ones were transferred but didn't stick as even with a euploid you only have 60-70% chance or something!
It was much easier at 36 than 38, if you want lots of children it is definitely worth considering embryo banking now although if you're like me you will just want to get on with your first pregnancy ASAP.