The factory worker is expecting a baby with her headteacher boyfriend Brian Packham (Peter Gunn), although her pregnancy got off to a rocky start when Brian revealed he had undergone a vasectomy and accused Julie of cheating.
"I should imagine Julie will be having some very interesting maternity outfits that she can make herself. That will be good fun," Cavanagh told MSN.
"I think [Julie and Brian are] all sorted now. They're on cloud nine and they're very excited about being parents. Julie's very, very happy, I think she's never been this happy.
"Julie just thinks Brian's amazing, so he's going to be this incredible father in Julie's head. I would imagine she is probably putting a lot of pressure on him, but I don't think Julie would think so.
"She has her own version of life, doesn't she? As far as she's concerned, Brian is absolutely delirious about having a baby and it's all going to be fabulous."
The 38-year-old actress recently signed up to play the Angel of the North in the Corrie stage musical Street Of Dreams.