You cannot murder what is not protected under the law. An unborn child has no rights under the law. It is not protected by any Constitution that I know of. It is not considered a person. One of the reason personhood amendments (laws that would change the definition of a person to include a fertilized human egg) overwhelmingly fail to be passed is because they all have the potential to convict women of a criminal offense should she suffer a miscarriage. Already there was one instance where a woman who attempted to commit suicide, but failed, while pregnant was charged with murder because her fetus did not survive. Would you charge this woman with murder if you were the prosecutor?
Now you personally may not approve of abortion, but quite frankly, who the heck cares what you believe when your life is not affected one bit by a woman in another part of the world choosing to abort a child she did not want, or cannot raise, or will not be able to carry to term, or was conceived in rape? You have no stake in any woman's decisions on whether to carry a child to term or not, even if the woman is someone you are in a relationship with.