This is a good point:
I support the idea of mandating vaccines, with minimal exemptions, and with permitting abortion before viability (and after in very limited cases). So how do I reconcile the positions?
Vaccines. People who aren't vaccinated can be infected by the virus, possibly permitting its evolution into variants, and definitely enabling its continued existence. Its existence is a danger to me and others. Being vaccinated carries a very low risk, so in my view the danger outweighs the risk, which warrants overriding an individual's preference and the vaccine mandate.
Abortion. Every thing equal, I'm in favor of humans. Birth of an infant is, on balance, good for me and the rest of humanity. It's one more mind and body who can improve life. But I'm also in favor of individual freedom, of autonomy. Strong protection of such freedoms is part of my vision of the best society. So if the prospective mother decides that her interests and sometimes her perception of the interest of the embryo are best served by an abortion, I have to take that seriously.
And what of the embryo? We say "life is sacred" but in fact we recognize that's not an absolute, not something which can be applied everywhere. Notably, we don't apply it to members of other species. (I'm not a vegan.) So I'm comfortable drawing the line at viability.