I've never had a pregnant cat before. She's almost a year old and has decided she rather live outside than inside. Lately she has been wanting to come inside which we have no problem with. A few weeks ago she was making these really loud awkward sounds that I figured were maybe her in heat. (Again, I've never had a cat do this, all of my cats have always been fixed. I've had cats all my life though). She's got a pretty big belly, although not HUGE yet, but very noticeable. Her nipples are slightly bigger & hard. & she's purring CONSTANTLY. Even when she sleeps! LOL. Does this sound pregnant? All her weight gain has been in her belly completely.