The reality TV star was briefly hospitalised after feeling unwell on a flight from Paris to Los Angeles last week, reported Contactmusic.
"Kim's got a real wake up call. Kanye's been on her the last few weeks to slow down but she's carried on regardless," a source said.
"Even her mom has been warning her to slow down but Kim's been on a hormone high, she's been using up her energy on working and not leaving much for the baby. Its a classic first time pregnancy error.
The 'Keeping Up with the Kardashians' star was advised by medics to slow down her work and exercise regime after being given the all-clear last week.
The 32-year-old is known to be working out regularly during her pregnancy with two trainers, one of them being Tracy Anderson.
Doctors have advised the TV star to take adequate rest during her pregnancy.