Personally, I'm pro life to an extent, not because I think life begins at conception; I don't, but because no matter how you look at it, it's denying an eventual person the opportunity to live. Up to a point, they don't exist yet as a person as far as I'm concerned. I don't know when exactly that point is, but either way, it's a choice to allow them to exist or not.
That said, I'm pro choice because I think it should be a personal decision that I don't think the government should make for anyone. Plus I'm a dude and consider it a woman's choice. If the vast majority of women ever come out in droves asking for it to be made illegal, then maybe I'll switch sides.