The couple, who have been dating for two years, are due to welcome their baby girl in January 2018.
"It was surprising and exciting all rolled into one," Charli, 37, told New Idea.
"I haven’t been vomiting or anything like that, I just feel like a slob," the Getaway presenter said, revealing that she was craving tinned spaghetti early on.
Their baby joy comes after Charli sadly suffered a miscarriage early on in their relationship when she was five weeks pregnant.
"It’s given me a complete new understanding for women out there and I love that the conversation about miscarriages is so open at the moment, because it’s such an isolating thing for a woman. It made us ready to be parents."