From Longman Dictionary of Contemporary Englishcorrect me if I’m wrongcorrect me if I’m wrongspokenNOT SURE used when you are not sure that what you are going to say is true or not Correct me if I’m wrong, but didn’t you say you’d never met him before? → correct
Examples from the Corpus
correct me if I’m wrong• Correct me if I'm wrong, but didn't you say you'd never met him before?correct me if I’m wrongcorrect me if I’m wrongused as a polite way of saying that you think what you are going to say is correct Correct me if I’m wrong, but didn’t you say you were going to do it? → wrong 