This exact question was asked before by an OP determined to find fault with whoever asked her. I don’t personally find it odd, even if it’s asked in the more existential sense, rather than ‘Are you happy with how the day is going?’
Women in particular are still often socialised to think it is supposed to be the happiest day of their lives, yet Mn is full of people saying how little they enjoyed their own weddings, because they found them stressful and exhausting.