In an interview with E! News, the 32-year-old reality star said: "I wouldn't say that pregnancy has been easy but there's been no morning sickness.
"When people say pregnancy is fun and they love it, I would disagree. I think from this stage on it does become easier and funner but it's just adjusting."
Kimmy went on: "Even my sister has made it look so easy and it's not as easy as people think. It's a little painful, there's a lot of growing pains.
"But I've heard it's all worth it so I'm looking forward to that."
And Kim revealed she is already getting cravings - unfortunately the thing she wants most is strictly off limits.
She explained: "I'm craving sushi, but I know I can't really have it, so I'm eating a lot of carrots and celery with lots of ranch."
The curvy star also said she has "no preference" when it comes to the sex of the baby, though US site TMZ reports that she and Kanye West intend to find out whether it's a boy or a girl as soon as possible.