Fox, 28, said she finds it tough to be a working mom, reported Contactmusic.
"I've never been an extraordinarily ambitious girl but especially once I got pregnant, it's so hard to be a working mom especially when your heart is not in your work, when your heart is with your family," she said.
Fox, however, is not leaving the film industry just yet and recently finished filming the 'Teenage Mutant Ninja Turtles'.