Hi Emily

I know it is tough when we have good eggs and none to freeze and the question of whether one should have freeze some at day 3 raises many what ifs.

From my understanding, for first cycly you have a a very good collection of quality egg. Ususally in the first cycle not everyone gets mature eggs that would fertilise let along make it to embies. Take me for instance, got 22 eggs in first cycle, 10 fertilised and only 3 made it to freeze at day 3 but even so they were not so good and I didn't get good results with FET.

Also from what I know, culturing blasts are much more difficult because the embies have to survive outside the womb much longer (ie in vitro and that is harder). Not getting any good embies to reach blast is thus not uncommon. It is not proven as the cause of them ceasing but the theory is, the embies not surviving to day 5 could be because the inefffectiveness of the lab technology to "copy" the womb environment or that the embies themselves are lacking in the genetic capacity to grow anymore. If the latter is correct then no matter whether you freeze them at day 3 or day 5 you would probably still fail in the transfers.

What we know for sure is that if embies reach blast and survive, research shows success rate is much higher than day 3.

I think it is a balancing act, if you have a good collection of fertilsed eggs perhaps to freeze some at day 3 and grow the rest to day 5????

I hope the one you just had transfered would be all that it takes for you to get your long waited BFP.

Good luck.