"Why am I the last person to find out everything?" he asked a small news conference for his upcoming movie "Guess Who" with Bernie Mac.
"If Demi is pregnant she's certainly not showing yet," Kutcher said. "So that would be news to me."
"Guess Who" premiers March 25.
Kutcher also said he has only one episode of "That '70s Show" left to film before leaves to concentrate on his film career.
"For me, it's a little scary," he said. "It's kind of been my safety net for seven years and just thinking about leaving I already miss all of my friends. I mean, they're really my family out here. When I moved out here I didn't know anyone and the only people that I'd met and known was the cast of that show and they all became my best friends."