I have no idea when life actually begins, or what is the actual morally correct thing to do.
What I do know is that life can be pretty shitty as it is, and forcing someone to enter the world with parents who didn't want them seems like a fucking atrocious start. However, there are a lot of people who had terrible upbringings who contributed to society, in both good and bad ways.
So who knows. This is why I focus more on letting people have the right to choose. If it is a horrible sin to have an abortion, let the people involved hold the weight. I love how theres always been problems with poverty, crime, hunger etc, but this is the one issue where all of a sudden people jump up and act like they have to be the moral vanguard of the country. It never made sense to me.