The actress plays Sunita Alahan, who is having an affair with Karl Munro - portrayed by John Michie.
"I cried at home the night before, just thinking about it. It wasn't just the idea of getting undressed, it was the kissing and the fact that there were going to be people in the room while we filmed it. It makes you feel very shy," she told The People.
"And, because it's Coronation Street, it's going to be watched by millions of people. A lot of it was to do with how I feel about myself, which added to the anxiety. I have concerns about my body and I will always have concerns, and I did tell John because I think he needed to know.
"He's new to me and I'm new to him so I just needed him to know that I was absolutely petrified. In the story Karl and Sunita are in a hotel room together. The viewers will only see little glimpses of it, but my dress came off which was quite scary and I end up just wearing my underwear.
"I really had to psyche myself up to do it. As I sat there waiting to start I did have tears in my eyes because I felt so scared."
Gulati added that, while she doesn't condone her character's behaviour, she does understand it as she is "old enough to have made mistakes".
"We've all done it. Somewhere down the line we've all told lies and said things that aren't correct. But now, looking back on all that madness, I wouldn't do it again. Now I don't know if an affair can ever be justified, to be absolutely honest, it's betrayal," she said.
The actress concluded by revealing that she receives more attention from male fans since Sunita's raunchier storylines.