A source told the New York Post that the 32-year-old socialite started feeling ill on the plane from Paris, and called friends as soon as she landed and was taken to her doctor.
Kardashian was sent home at 12:30 am after she was examined and given the all-clear but doctors told her that she is working and exercising too hard, and gave her a stern warning to rest.
The source said that Kardashian is not respecting her pregnancy and has been running around, working out seven days a week with two different trainers to control her weight, including Tracy Anderson and a pregnancy trainer.
The four-months-pregnant star had flown to Paris on Sunday to join her boyfriend Kanye West at a Givenchy show and dinner after, with guests including Frank Ocean and designer Riccardo Tisci.
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