A few years ago, I had considered myself "pro-choice". I didn't see any real problem with abortion until I came across a video titled "The Silent Scream", which is basically an ultrasound of an abortion. It looked to me as though the baby was trying to escape the instrument of its death. It can be argued that it's just "reflex arcs, it's not really feeling anything", but let me say this: all pain you feel is "just a reflex arc" being interpreted by the brain as pain. It could be argued that it's just a clump of cells, but so is everyone else. "Consciousness doesn't exist for them"... who's to say? Babies react to all sorts of things in the womb. In a life of working in medicine, I saw some things that were horrific, but nothing turned my stomach like watching that video. I've been adamantly "pro-life" since.
Another good one was when I was standing in line at Walmart with my daughter, who's still an infant. A kind old man behind me struck up a conversation and out of nowhere, he says "You have three seconds to answer. The angel of the Lord comes to you and says 'I will take your life, or hers. Choose.'" I automatically answer that of course it could take me. He asks the same question, but with my father. I hesitate, and without stopping he repeats the question, but with my mother. My head is wrapped with questions, wondering if my parents would want that, who would take care of my daughter, etc, too much to react in time to a thought experiment.
The gentleman then says "That's the difference between a parent's love and a child's love. You are unthinkingly ready to sacrifice yourself for your child, but not your parents. She will never love you the way you love her. And that's okay. That's the way it's supposed to be. If she did, she'd never leave. We're not meant to remain with our parents." It really made me appreciate my parents in a way I hadn't before.