Is There a Consensus Among the Scientific Community?

It was only in the past few centuries that we've discovered sperm egg and then the process of fertilization. The fact that people were wrong about biological development, even people like saint thomas aquinas, who followed the biology of aristotle, doesnit mean that we're wrong now. We have the scientific evidence on our side for the fact that a human being begins to exist after a successful fertilization. Do you believe that after fertilization, you have a human embryo? Is it an embryo? Well, what is an embryo? It's a human organism at a particular stage of development. You can't define the terms embryo or fetus without referring to the human being that exists there.