Somebody explain to me (because a lot of you seem to be making this judgment) why they think the 'rights' of a foetus/embryo to live outweighs the rights of a woman to do whatever the hell she wants to her body?

A lot of you are like, 'OK, if it's rape then abortion should be legal, but if some woman is being reckless then abortion isn't OK'. Why does that matter? The only thing that should matter is whether or not the woman wants to have the baby and how far along the pregnancy is.

tldr; why is unborn life so 'sacred' and negates the rights of a woman to do whatever she wants with her body? I can only assume this moral position comes from people that are religious or grew up around religion.