Oprah does a lot of good works, but she also has told many versions of her early pregnancy and giving birth. Today she gave back-flip of her hand and said, "I don't know, I've never been pregnant". I have heard her on earlier shows saying that she had a baby at an early age (12 or 13) that was (version #1) "born dead" or (version #2) "died later". Now, according to her, it never happened at all.
Actually she said that she doesn't have kids, or never had kids. That's different from saying she's never gave birth. The baby she had at 14 died, and I doubt she would try to lie about it since she talked extensively about it in A&E's biography which was the highest rated show in the history of A&E