Life begins at conception. Human life is different because of how we function, not because we are.
I think more people look at when the cells change to a baby that reacts, feels, hears...or human like. I could be convinced that 6 weeks is that point but I have not seen anything that proves that. I have seen a 6 month old in the family (in-laws) born successfully. I understand there is a 21 week old that was born and survived. I know as a father that they heard me and reacted at much younger ages than that.