How do you know when you are done?

No I wasn't pondering the subject, although I am pretty much constantly asked (Four times yesterday alone!) I just thought it was an interesting topic. And what's weird is that if you read the comments, I've experienced the exact same thing as post number 12. It sounds strange but when I was first pregnant with Jacob (before I knew it yet) I would constantly think I heard a child crying. I would look around and all my kids were right there. Or I would feel as though one of us was missing and look around and we were all there. This faded as the pregnancy continued. I think it's an interesting to hear what convinced people that they were done.