I also don't know why women deny this...maybe it's not the public's business, but it's not like we are not gonna find out eventually. Especially if it's a celeb.
If she is anything like I was when PG, I just didn't want to talk about it right away. I wanted to make sure everything was okay, plus I wanted a little private time to enjoy "our" little secrete. lol Of course I am not a celebrity! lol
If I were JLo, I would keep it a secrete as long as I could just to keep the press away. Now that they know, they will follow her and Mark every time they step outside their home. I would hate that, but that is a part of being rich and famous because you are a celebrity. I hope they have a healthy baby and that they will have a happy family life.