Washington, November 24 Reality star Spencer Pratt is worried that his wife Heidi Montag could be pregnant.

In a recent episode of reality show 'The Hills,' which follows the personal lives of several young people living in Los Angeles, Pratt talked to a pal about chances of Montag being pregnant.

He revealed that he took her to Hollywood sushi hot spot Katsuya "for a little alcohol test," but she declined to take even a sip.

Pratt further said: "What if she's already pregnant?"

He added in that case their marriage is "game over."

The couple has been at loggerheads over the baby issue in the recent past.

In fact, Pratt has been so against the idea that he even considered a vasectomy, reports US magazine.

He had told MTV News in September: "I'm a baby. I'm not prepared. And I'm not sure the world wants a Spencer Pratt spawn." (ANI)