Early sales indications released by the Official Charts Company show she is already ahead of her nearest rival by 4,000 copies with her release The Power Of Love.
The mother-to-be has released her album way ahead of the normal autumn release date for X Factor winners, ensuring it was in the shops in time for Mother's Day on Sunday.
She has already achieved a number one single with her performance of Skyscraper in the wake of her series win in December, although its first week sale was a third of that achieved a year earlier by the 2012 X Factor winner James Arthur.
If she continues to sell well she will knock George Michael off the number one position with his Symphonica album. It would be the highest charting X Factor winner album since Alexandra Burke debuted at number one in October 2009, according to the chart firm.
Roger Daltrey's collaboration with terminally ill guitarist Wilko Johnson, called Going Back Home, is in line to take the number two spot if sales patterns continue into the weekend.
Bailey's album includes covers of tracks such as From This Moment On and the Dreamgirls song And I Am Telling You I'm Not Going, together with the title track, originally by Jennifer Rush.