Most people erroneously believe that their bodies are the substrates of their consciousness, whereas, in reality, their bodies are the intersubjectively constituted/projected phenomenal self-representations of their transcendental subjects, the phenomenal projections of their consciousness into this intersubjective world.
The body is appropriated, as Yogācāra Buddhist thinkers would say, by transcendental subject presumably when the pineal gland is formed. If we come to a consensus on the timing of the appropriation, we may have a consensus on abortion.