You want to try and bring a character to life in an honest a way as you possibly can. It doesn't matter whether he's a doctor an actor a car salesman or a captain of a starship. If you can bring truth and honesty to that character then your audience will believe you.
I really like being pregnant. Not that there aren't things I don't love but when I think about what my body is doing - creating a child - it just blows my mind. I'm in awe of the process and science.