I'm sure many have seen the two Alien vs. Predator movies, which, besides having thin stories and bad acting, have some interesting concepts to play with. I am, of course, talking about that infamous hospital scene:
Basically, looking for a female to play opposite me to have that happen to her. Although the premise is the same, it would be a bit more dragged out, so that she would have to carry around a huge stomach for some time.
I know I haven't explained much, but if you're interested, PM me!