Good for you. That's noble, in its own way. Aren't you glad you get to make that choice? Imagine if you were forced to side with the mother no matter what! If there were some law in place that said that no matter what you want, or even what the mother wants, doctors were forced to side with the mother at the expense of the baby. If the mother's life is in danger, automatic abortion, regardless of what you have to say. Wouldn't that kinda suck?
You say you'd always side with the child. Some would always side with the mother. Some would side with either, depending on the specific situation. Shouldn't that be their choice?