I don't see abortion as murder. Especially in the form of plan B. Plan B just stops the process from even initiating. Abortion is disposing of potential.
Let's use a horrible analogy that I'm making up as I type this: We are trying to make a strawberry banana smoothie. To make this, you need a banana, a few strawberries, a couple of ice cubes and some milk; to make a child, you need sperm and an egg. Throw the banana, strawberries, ice and milk into the blender (sperm --> egg), so now the ingredients for the strawberry banana smoothie (as well as the child development process) are together, but haven't started yet.
So we start the blender for only half of a second before quickly stopping it and throwing it out because we decided we don't want a smoothie. The process would have begun, that is true. It had all of the right ingredients, had started the process, and had
INTENT to become a strawberry banana smoothie, but is it one when we stopped the process and threw it out? No. It was not far enough in the process to be considered one. It was still just a jumbled mess of ingredients.
When you have an abortion, you're not killing a human. That's illegal. There are laws that are in place so that you cannot have an abortion after (x) amount of time into the development process. After that, it's too late and you have to have the kid regardless. But until that time, you're just stopping something that had the potential to become a human; not yet a human itself.
Again, this is a terrible analogy and your girlfriend will probably beat you unconscious if you try to explain it to her like this.
I wonder how many people will get pissed off at me for comparing baby making/abortion to making a strawberry banana smoothie?