But she told Red magazine: “I always worry there’s not going to be another job, my little period of doing well is going to dwindle.
“I’m a very positive person, but I’m a realist too.”
And she said not planning her future “might bite me on the arse one day”.
She said: “I still have imposter syndrome. I still think someone’s going to rumble me.”
But the mother-of-three said she would “happily” become a midwife, having trained on a maternity ward for a documentary on TV channel W, if her TV career did come to an end.
Willis also spoke about having her third baby at 40, saying: “I didn’t want to look back and regret it.”
And on husband Matt Willis she said: “I still fancy him to bits. He makes me laugh.”
The full interview is in next issue of Red, on sale on July 3.