Where in the Bible does it state that life starts at conception?

The book of Jeremiah 20:17 indicates that life starts at conception. It reads, “Because he slew me not from the womb; or that my mother might have been my grave, and her womb to be always great with me.” By saying that he was not “slain” in the womb, the prophet Jeremiah is indicating that he was “alive” in the womb; otherwise, he naturally could not have been slain. On account of the Iron Age limitations in knowledge concerning pregnancies, this verse does not specify if Jeremiah is a zygote, an embryo, or a fetus. Thus, it can be safely assumed, that the prophet Jeremiah is talking about the entire developmental period following conception.