Sararms, I hope that whatever your Dr suggests for you works. In the end, that's all anyone wants. Chances are, given your young age, you'll succeed in the next couple of cycles anyway, regardless of whether you have day 2/3 or blast transfers done.
Research as much as you can and remember what our very own Oracle of BB, Sushee (aka Apollo), has said:

I don't necessarily believe that every embryo that succumbs in the petri dish before Day 5 wouldn't have gone on to make a baby. For that matter, neither does my Dr.
because of the embryo loss associated with blast transfer, it may take as long to achieve a pg, and as many cycles, as it would have with a Day 2 transfer. This is why most clinics will not attempt a blast transfer if embryo numbers are low to start with, as often it is emotionally and physically beneficial to the patient (and maybe the embryos as well!) to get to transfer rather than potentially lose every embryo and have to cancel their cycle. In this way, there is no benefit to a blast transfer if only 1 or 2 embryos are available at day 2, except for intellectual reasons as to whether your embryos were surviving past Day 3.

It's a hard, hard road and very difficult, when just starting out, not to see everything offered as the panacea that you so badly desire.

You'll be fine and I'm sure by this time next year you'll be a mum - one way or another!