Harold's character Lola Pearce - Billy Mitchell's granddaughter - will give birth next Monday (July 23) in scenes to be aired live on BBC One.
© BBC
© BBC
She confessed to What's on TV regarding the challenge: "I'm terrified! I'd rather have a baby in real life than do this live!"
However, the star added: "But it's a once-in-a-lifetime opportunity and it is nice of them to trust me with it.
"We've already filmed the lead-up to the birth and I was knackered after screaming and crying and pretending to push all day."
© BBC
Speaking to Digital Spy recently, Harold stated her belief that she has improved as an actress since joining the soap.
Meanwhile, Perry Fenwick - who plays Billy - displayed similar apprehension earlier this month over his live Olympics torch run.
> Read our recent interview with EastEnders actor Perry Fenwick here
