Nick and Leanne initially plan to tie the knot while on holiday in Las Vegas with Simon ahead of the festive season, but are forced to postpone the nuptials when Peter Barlow returns to the street unexpectedly and wants to spend time with his son.
As Leanne insists that they can't go ahead with the Vegas ceremony without Simon, Nick is left fearful that she could be having cold feet over their future.
Price told Radio Times: "Nick starts to think that this isn't going to end well. He can see Peter's got his claws in and he can't understand why Leanne is even entertaining this bloke.
"Peter left for four months with another woman, he abandoned his own kid, left her to run his business, then he comes back and she's torn. Nick realises there's something else going on here."
The actor added that Nick is hoping to find out what Leanne's true feelings are when he later arranges plan B - an expensive wedding ceremony for December 25.
Price said: "I think he's trying to kid himself, and also it's emotional blackmail. He books a huge place, he sorts it for Christmas Day and he makes it all work, which is what Nick does, he makes things work. Nick facilitates what Nick wants.
"I don't think Leanne's very happy when she finds out. I think she feels caught on the hop and maybe a bit emotionally blackmailed by Nick. But Peter's playing dirty tricks and maybe Nick thinks that if Leanne loves him, then she shouldn't be that bothered about him booking the wedding. I think Nick's testing her."
Nick and Leanne's wedding will be the biggest storyline in Coronation Street's Christmas Day episode this year, but show bosses are keeping tight-lipped about whether the ceremony actually goes ahead.
Price explained: "I think it will be fun. It's great to have such a big storyline on Christmas Day. It's amazing. It's safe to say it's not going to run smoothly - it's going to be much more of a rocky road than even a rocky road is! It's not just about Leanne and Nick. There are so many other factors involved."
Coronation Street continues on Friday (December 7) at 7.30pm and 8.30pm on ITV1.