human being. Even our laws, at least with regards to other animals shows we know that a new life comes into being at conception. Breaking the eggs of bald eagles is a felony... the same crime as killing any other bald eagle, whether juvenile or adult. The same is true for breaking the eggs of endangered turtles... felony, with major fines and more than a year in prison. Baby humans, not so much.
If you are truly interested in knowing the scientific facts, though I am skeptical that you are, look here:
When Does Human Life Begin?
https://prolifepages.wordpress.com/2012/09/19/when-does-human-life-begin/