The rumour mills were abuzz that the 35-year-old is in her first trimester after she was recently noticed with a baby bump in a seven-star hotel in Mumbai.
"If something happens, everyone will come to know on its own, " Karisma told.
Married to Delhi-based businessman Sanjay Kapur, Karisma has a four-year-old daughter Samaira.
She was in the capital Wednesday to kick off the "Almonds - The All Natural Taste of a Good Life" campaign launched by the Almond Board of California.
One of the leading actresses of her time, Karisma took a sabbatical from the big screen after her marriage in 2003.
Asked how she has been keeping busy all these years, she said: "I have been keeping pretty busy with my family. I have also done some reality shows, endorsements and promotions. So it has been a great balance for me."
"I started when I was 15. My first movie ('Prem Qaidi') released before even my 16th birthday. Then, when I got married, I realised I had literally worked like a dog. I had worked in 82 movies and that's quite a lot. So I just enjoy the break and it's a great balance now. At least I am not running from studio to studio like a mad person, " she explained.
Post-marriage, Karisma was only been seen as a judge on the reality shows "Nach Baliye 4" (2008) and "Hans Baliye" (2009), apart from a cameo in Shah Rukh Khan starrer "Om Shanti Om" (2007).
Two of her delayed films, "Mere Jeevan Saathi" and "Zamaanat", were released in 2006 and 2009 respectively.
So no chances of a comeback for Karisma on the silver screen?
"It feels nice if people want me back. I'm offered a lot of scripts but I have not accepted anything yet because I haven't felt the burning desire to jump into a film right now. But may be, in a while, when the family and everything is settled, I will, " she said.
"I have always followed my gut feeling. I am just waiting to get that vibe. I should just feel it from within. I just don't want to do a project that will create an unnecessary buzz, etc until I get a script. It's better to wait and be safe than be sorry", she added.
Karisma had a successful stint with director David Dhawan. They gave hits like "Jodi No.1", "Haseena Maan Jaayegi" and "Biwi No.1" and also teamed up after nine years to judge the reality show "Hans Baliye".
On being asked if she would ever work again with Dhawan, she said: "Davidji has really been pestering me to do a movie. During 'Hans Baliye' also he used to call me back (into films). He's working on a script for me, so once that is ready, may be I'll do it."
Probed more on the script, she said: "I can't say anything more on that right now."
The four-time Filmfare award winning actress is also ready to work with Govinda, with whom she has done movies like "Raja Babu", "Dulaara", "Khuddar", "Coolie No.1", "Saajan Chale Sasural", "Hero No.1", "Haseena Maan Jaayegi" and "Shikari".
"Why not? But at the end of the day, the script will be the king, " Karisma pointed out.