It doesn't matter when life begins. It doesn't matter whether a fetus is a human being or not. That entire argument is a red herring, a distraction, a subjective and unwinnable argument that could not matter less. It doesn't matter whether we're talking about a fertilized egg, or a fetus, or a baby, or a five year old, or a Nobel Prize winning pediatric oncologist. NOBODY has the right to use your body, against your will, even to save their life, or the life of another person. That's it. That's the argument. You cannot be forced to donate blood, or marrow, or organs, even though thousands die every year, on waiting lists. They cannot even harvest your organs after your death without your explicit, written, pre-mortem permission. Denying women the right to abortion means we have less bodily autonomy than a corpse.