It is important to understand that no one knows When personhood begins and when there is soul.  Not even the RCC has made this claim.   I was taught in the 1950's by the good nuns that mind was part of soul (or in mathematical terminology a subset of soul).  We do know that there is no possibility for mind until the development of cerebral cortex at 22 weeks.  Yet we do not know if this constitutes personhood.  We do know that in rare cases a fetus of 22 weeks severely threatens the life of the mother.  For her to continue the pregnancy essentially means the loss of her life or a severe threat of loss of her life,  and also in some cases the loss of the mother of other children.  Ethically, laws must not decide this issue, only the mother and her doctor have the right to do this.