The 32-year-old pregnant star said that pregnancy has been tougher than she expected, reported People magazine.
"Being pregnant is not as easy as my sister (Kourtney) made it look or as my mom (Kris Jenner) has made it look. It's a little painful. I've gotten sick a couple times, and that puts you out."
"I like to be active......But I've been chilling out. I took a week off just to rest. It was amazing," she added.
Kim was briefly hospitalised after feeling unwell on a flight from Paris to Los Angeles last week.
Talking about changes in her life after she got pregnant, Kim said, "I'm craving carrots and ranch dressing. I used to love sweets, not anymore. (I) can't even eat chocolate.