It would be terrible if we found out that human life does indeed start at conception and all of those humans were murdered, sometimes brutally.
There is so little that we understand about nature and our humanity.
It is not above my pay grade to realize that if something is growing inside as a result of sexual relations which normally results in birth of children, and which even has a pulse at around 5–6 weeks of pregnancy, then I should treat it as a child, which it is only increasingly manifest to be, versus treating it as a cancerous growth.