mummy, dun be sad *Hugz*. U will succeed the next round.
I dun think is extreme bloatedness, coz ladies who experienced ohss who are so bloated that need tapping also can get pregnant. That time I thought good grade embryos will sure strike, but not necessary. Coz there r simply too many factors to a successful pregnancy. embryos r graded based on egg quality. How abt generic after they are fertilized? womb's lining is impt but the layering is too, I read somewhere. There r many more.. Too complex for doctors to explain 1 by 1 also....
If u ask a doc, why fail, esp egg is good, lining is good, etc, etc. Doc can't answer u also.... He will just say maybe better luck next time or the less tactful one may just says 'too bad'
I believe that u will strike One, just be more patient okay. Good luck!