Spencer Pratt Worries That Heidi Montag Is Pregnant

In this exclusive clip of Tuesday's Hills episode (watch above), Spencer Pratt worries that his wife Heidi Montag might be pregnant.

He confides in a pal that he took her to Hollywood sushi hot spot Katsuya "for a little alcohol test." He says she didn't even have a sip.

"What if she's already pregnant?" a worried Pratt, 26, asks his pal, adding that if that's the case their marriage is "game over."

The 23-year-old Montag -- who eloped with Pratt just one year ago this month -- has long been vocal about her desire to have kids.

Pratt is so against the idea that he even considered a vasectomy.

He 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."