Later this month, viewers will see Debbie tell Chas and mum Charity that she is expecting a baby, admitting that she is worried as the pregnancy was not planned.
To make matters worse, Debbie's news comes at a time when she is having problems with partner Cameron (Dominic Power) - fearing that he is having an affair with village minx Eve Jenson (Suzanne Shaw).
In an interview with All About Soap, Webb commented: "She's been struggling to trust Cameron, so finding out she's going to have his baby isn't going to help matters at all.
"She's also caught him flirting a bit with Eve Jenson and so she's been concentrating on getting to the bottom of that at the moment, rather than her pregnancy shock."
After Cameron convinces a paranoid Debbie that he has not been unfaithful, the blonde finally finds the confidence to tell him about the baby.
"He doesn't say anything at first, which makes her think he isn't interested in being a dad," Webb added. "But he's just trying to get her head around it like she was. He's eventually pleased, but he has got a lot of convincing to do before Debbie will believe he can change and be a good father to their child."
Debbie and Cameron's plot twist airs towards the end of May.
Read more about Emmerdale's Debbie and Cameron:-
> Emmerdale newcomer backs Debbie romance
> Emmerdale Debbie 'can trust Cameron'
> Emmerdale star: 'Cameron has dark side'
Watch a preview of tomorrow night's Emmerdale double bill in the video below: