As first revealed earlier this month, Izzy will discover that she is expecting a baby in an upcoming episode. However, she is frightened to share the news with Gary (Mikey North) as she knows he does not feel ready to start a family.
Houston told Soaplife of Izzy's reaction: "It's quite a shock. She's scared Gary is going to leave her and she'll have to do it on her own. How would she cope?
"She also wonders if she can physically do it with her disability. There is an increased chance of miscarriage, but lots of people with Ehlers-Danlos syndrome - which Izzy has - do carry babies full term."
Viewers will see Izzy receive some advice from Fiz Stape (Jennie McAlpine), who suggests that she should tell Gary the truth sooner rather than later.
Asked how Izzy would react if Gary failed to support her, Houston replied: "I think she'd definitely go it alone. Nobody can ever prove her wrong. She's just so blooming independent."
Backing the couple to get through the issue, she added: "I think it will bring them closer together. They are really connecting at the moment and looking out for each other."
Coronation Street launches Izzy's pregnancy storyline early next month.