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.
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"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.
