I'm going to throw in a currently unstated point that I think is effective against Pro-life. Hamnuts point was really good too.
People don't get upset because you are killing a baby, they get upset because you destroy the potential outcome for human life to develop. Here's what I say to you; loss of potential is generally not a tragedy. You don't step on a seedling and feel bad for killing a tree. If you really believed that taking away the creation of human life was terrible, you would be having sex all day everyday, trying to create as many babies as possible, because if you're not, you're preventing human life from existing.
Fuck the patriarchy, women can do what they want with there bodies. As soon as a baby can live by itself it can have a say. Forcing people to carry a baby can take away not only from the quality of life of the mother, but also from children that the woman could have in the future.
The majority of pro-life (and all) people eat meat, and that group of cells, or fetus has less 'life' in any form of the definition. It has less emotion, less physical perception. You might argue that so does someone with a severe developmental disability, and it would be wrong to kill them, right? Right, however, the value of life can commonly be seen in it's relationship to other living things. That person with the developmental disability has a family that knows them, has experienced them for years perhaps, and has watched them grow. A fetus has almost none of this attachment to the world, except through the mother. Again why it is the mothers decision. Of course, let's not even use the rape argument, that's a cop out. And if you're still pro-life in that scenario, then... welp... I give up.