"A pregnancy left undisturbed most of the time results in a healthy new life." ... The key word her is "results". It isn't a child yet - not until it's fully developed or born. Early on it's a potential person, not a person. It's easy for us (me included) to relate to it as a "baby" but society shouldn't impose it's beliefs about when life begins onto others, so I am pro-choice. I don't think abortion is great, easy, or always the best choice, but I sure don't think I or anyone else should be making that decision for other women.
Both the sperm and ova are living cells. When they unite, they create a unique living cell that will go through various stages from that moment on through the next 80 or so years. Each stage of life, has different characteristics and is precious