The Coronation Street star, 30, was on the programme chatting about her new MummaFit ToBe pre-natal workouts as well as being pregnant with her third child.
She's engaged to footballer Scott, but presenter Lorraine casually referred to their relationship as a "marriage".
The Scottish presenter said: "Now, being married to a footballer, of course, he used to play for Celtic, you have to move."
"You had to move house yesterday and you're living in Preston now I believe?", Lorraine added.
Helen didn't correct Lorraine after she referred to her as being married, and instead replied: "Yeah we're living back home really..."
Was this just a mishap on Lorraine's part, or did she let slip Helen's 'secret wedding' to Scott to ITV viewers?
Helen then moved the discussion onto the subject of homeschooling as she said: "Yesterday was my first day of homeschooling, so that can be quite challenging I suppose but you can only just do your best."
Later, Lorraine asked the soap star whether she would ever consider returning to Coronation Street as the iconic Rosie Webster.
Flanagan confirmed she'd love the opportunity to return to Weatherfield as she gushed: "I miss Corrie so much, I really do.
"I miss the excitement of filming, I miss Brooke and I miss Sally."
"I really, really want to go back", she said before adding she possibly will "when the timings right".
Helen's MummaFit ToBe pre-natal workouts are on fitness app TRUCONNECT by TV.FIT
Lorraine airs weekdays at 9am on ITV.