She revealed the news in a clip that appeared after Sunday’s episode of the E! reality show “Keeping Up With the Kardashians.”
The show documented her fertility struggles, and she confided that an attempt to conceive through in vitro fertilization had failed.
The clip shows Kardashian telling her sister, Khloe, that a blood test following another attempt confirmed she was pregnant.
Kardashian and West have a nearly 2-year-old daughter, North West, who was born on June 15, 2013.