Semantics make everything very, very tricky. You see "it" is not merely an "embryo" but a "baby." So, lets rewrite that sentence like this:
What's better?
For 1 baby to be born, grow, learn to know and love god, and become saved, with 1 baby lost in the process of IVF........or for the 1 baby to never have existed at all?
Hmmm, in other words, in order to make a baby, you have to kill a baby.
In this case, in order to make ONE baby, 140 were destroyed.