Kourtney Kardashian is reportedly worried that her longtime boyfriend Scott Disick will leave her before the birth of their third child together.

"She's terrified she's going to end up a single mother, dumped in the delivery room," a source told tabloid Life & Style. "Kourtney will be left with three children and no one to father them."

Kardashian announced her third pregnancy on the ninth season premiere of her family's reality show "Keeping Up with the Kardashians" in June. Disick was clearly dissatisfied upon learning he was going to be a father again.

"You just keep suckering me into these kids. I can't handle all of this responsibility," he said after Kardashian told him she was pregnant.

"Kourtney feels scared and alone. She never thought she would be in this position," added the source.

Kardashian and Disick are already parents to Mason Dash Disick, 4, and Penelope Scotland Disick, 2. The couple, together since 2007, has been experiencing issues as of late because of Disick's drinking habits. He's reportedly vowed to stay away from alcohol until the new baby is born.

The issue of Life & Style detailing Kardashian's alleged fear of being alone hits stands on Sept. 29.