Abortion arguments don't make sense

I'm largely pro-life and only consider abortion ok if the life of the mother is in danger if she continues with the pregnancy. However, for people who get it because the timing wasn't right, they don't want the baby, or any other reason like those, are not valid in argument. They all preach about pro choice, but I got to thinking. Isn't pro choice being able to decide what to do with your body/life? If that's so then the argument is invalid. Because your saying everyone has the right to decide what to do with their body/life, key word "right". Then how is it when they get an abortion they don't realize they've just taken away someone else's right to do what they please with their body/life? You can't argue that then take away that right from someone before they're even brought into the world. All I see abortion as is ending a life before it truly begins. Just because you didn't want to take the time to open the book doesn't mean you can seal it shut before anyone has the chance to even read the title.