Stone, 30, who has 14-month-old son with actor-husband David Walliams, said her work got affected by her pregnancy, reported the Femalefirst.
"Being pregnant affected my work quite early on, it's not like you can work until you're eight months pregnant. It was quite frightening seeing my body change so much. Yes, I did worry about the impact, because my body is my job and my livelihood," she said.
Stone took a year break from work to be with her son but was keen to get back to the ramp as she hated sitting around.
"I like working and I don't like sitting around at home, so I really wanted to get back into things. It's nice once the baby's here, but then I was like, 'I really want to do something again,' " the model said.