Mariah Carey has said she was made to feel “extremely uncomfortable” during an interview with Ellen DeGeneres, in which the pop star was pushed into revealing a pregnancy that she later miscarried.Carey appeared on DeGeneres’ US talk show in 2008, when DeGeneres asked the star to either confirm or deny tabloid rumours that she was expecting a baby with then-husband Nick Cannon.Despite Carey’s protests that she wanted to change the subject, DeGeneres offered Carey a glass of champagne to “toast