Maternal Mortality--one of the many phenomena about which you need to be informed before you can engage in meaningful discourse on the subject of abortion.
I'd encourage you to conduct independent research on the matter, but myself and others would likely be willing to give you a primer. Engaging people on the "other side" who approach in good faith can be an excellent excercise in at least trying to set aside biases.
If I could offer ANY advice up front (to anyone, myself included), it's to give your current feelings on the matter a nice big hug, then shelf them for the duration of conversations regarding abortion. They'll still be there when you're done. Next, don't expect to change anyone's mind, or even make a dent in their views. In fact, expect not to. You probably won't in any case, which is fine. The point is (to me at least) to increase understanding of other people's views, how they arrived at them and why they hold them. That's all. If you set out with the agenda of turning people towards your views on the matter, you're probably going to have a bad time. And this goes both ways. This is arguably the single most incendiary topic in modern history, and keeping emotions out of it is unlikely at best. Honestly, whether or not you take away anything meaningful for yourself, if you made it through the process having maintained civility, you've won a tremendous victory.