Biology precisely describes all stages of human reproduction, from conception, fertilization, migration of the egg to the uterine wall, etc. until delivery.
You can easily get any information you want.
However, the "when does life begin" question has nothing to do with science. It's usually discussed within the useless abortion debate in the United States.
It is not a scientific issue, it's a religious war.
If your religion forbids you pork meat, abortion, or gay sex, just avoid pork abortion and gays, and don't ask science to support your choices.
(writing this I just noticed that gay sex is a good anti-abortion method :))