Bb
Did they push u after ur embbies are fettilised, if they do, that really shows u have good embbies to begin with, thats why they are confident. Since they suggest blasto for u , that's a good sign. I knew of someone who only have 7 embbies, blasted all of them and only left 2 good grade blasto. She ended up twins. Blasto has very gd chance, and I think u will succeed since u have 4. Good luck
Niko,
For blasto, the cells are countless, hundreds and thousands of cells until cannot see, that's why its called blastocyst.