Kylie will discover that she is expecting a baby later this week, but the revelation leaves her in turmoil as she cannot be sure whether the father is her husband David (Jack P Shepherd) or his half-brother Nick (Ben Price).
Viewers saw Kylie and Nick spend the night together at Christmas, but Lane told itv.com that the story is avoiding clichés as an ongoing affair isn't on the cards.
Lane commented: "It's a fabulous twist, and not the old cliché that soaps sometimes give to the audience - where the brother and the girlfriend have the affair. There's more in this - there's more layers.
"It's come about from two people who had a need. It's not about a secret affair."
The actress confirmed that Nick will be "absolutely devastated" when Kylie shares her big news with him.
As previously reported, Nick wants Kylie to have an abortion, but whether she will go ahead with this remains to be seen.
Lane continued: "I think Kylie's got a mixed bag of emotions at the minute, because there is that chance that it could be David's baby. She's trying to hold onto that as much as she can.
"But she's got Nick in the background saying, 'We can't, because the chance is there that it could be mine'. Who knows what she's going to do?"
Coronation Street continues tonight (January 7) at 7.30pm and 8.30pm on ITV1. Get the Inside Soap magazine on your iPhone or iPad