Failed 1st ifv cycle with perfect graded single embryo. All other levels were perfect too. Should I insist on 2 or 3 embryos next (frozen) transfer?

FET. Sorry for the disappointment! according to asrm guidelines (if your actual age is 34) you could be an appropriate candidate for 2-3 embryos. Rather than insisting on a specific number, why don't you 'insist' that your doctor reach an agreement you are both satified with?