The first sign I know my Sim is expecting is of course the "Rock-A-Bye Baby" jingle after WooHooing. The other early signs were the nausea and vomiting. For one of my Sims, she started to have weird cravings early on. Her favorite food is Spaghetti and she craved it with ice cream, then with peanut butter sandwiches. She had a moment once where she paused and smiled, patted or rubbed her tummy and then I saw the bubble above her head with a pair of baby booties and then the baby bottle. It all happened so fast that I couldn't think fast enough to hit the camera button. I was too caught up in the moment, lol. It was really a cute moment, it made me stop and appreciate the realism in the game. I'm a mommy so I get all sappy with these kind of things, lol.