People are starting to wonder

I have heard before that when a girl (woman...whatever!) gets pregnant that she has a glow about her that other woman can recognize. At this point in the "game" Jennifer and I are doing our best to not blatantly lie to people if they ask, but we are also trying to keep a secret. So, how do you keep a secret and not lie to people when they ask you such a direct question like, are you pregnant?