IUD = Intra Uterine Device - put in place in a health clinic and works by preventing implantation. So technically, according to your definition, "murdering" the zygote.
The thing is, with your definition, and your stance that "taking a life" is always wrong, it doesn't fit with the real world. When a doctor administers morpheine to a dying patient, technically s/he is "taking" hours or days of life, which would otherwise be intolerable suffering. So is it wrong?
You have also agreed that removing a living fetus to save a mother's life could be a non-criminal choice. So perhaps, if a fetus could be seen to be so malformed that it could only life briefly if at all, that might be another lawful "choice".
This is why it's already not a black and white issue, education, options, support all help, and coercion probably will only make bad worse.