Only 2 are mention killed in the womb but how many were kill in the test tube or how many die that failed to implant. Life begins at conception and that is when the soul is created. This is the the ultimate is selfishness thinking of yourself and not the souls of the children
Many naturally conceived embryos, around half of them, fail to implant, or miscarry so early that pregnancy goes unrecognized.
It is not on those grounds that IVF can be condemned.