Though it was a false alarm, Kardashian has now been advised by her doctors to stop overdoing her workout sessions and get more rest, reported New York Post.
The four-months-pregnant reality star flew to Paris on Sunday to join Kanye West at a Givenchy show.
The 32-year-old returned from Los Angeles on Tuesday night.
"Kim started feeling ill on the plane from Paris, and called friends as soon as she landed. She was rushed to her doctor Tuesday night in tears. She thought she was having a miscarriage."
Kardashian is known to have working out with two different trainers to control her weight, including Tracy Anderson and a pregnancy trainer.