Actually all my transfers are blastocyst except for once it’s day 4.
However I have more BFN than BFP.

So I feel my issue is not only embryos but also the womb
How I concluded that high dose doesn’t work for me is during the cycle which I had the max dose, I’ve no embryos left surviving. Whereas for lower dosage my embryos managed to grow to blastocyst.
And the 2 BFP I had are the cycles which I had the lowest dose though 1 ended in MC
However the number of embryos I have is always max 2- 4 only. But no choice, I think quality is more impt than quantity for my case.. too bad.. have to go through many fresh cycles :/
Anyway IVF is really a trial and error game. There’s different meds and dosage to play around with. There’s also other things such as endo scratch, removal of fibroids or endo etc etc..
And i also believe in affinity between you and the doc
Lastly, what I have to say is time wait for no man, the earlier and younger you start, the higher chance you have. Kind of regretted not starting ttc as soon as we got married but too bad, can’t reverse time. Can only look forward