Quote Madam' Fire fly: I wonder what they will do in the show to hide it since she can not have a child.... ~)
It looks to me like they've been just putting her in larger clothes to try and minimize the baby. They probably won't say anything - just maybe making people think Gwen's just gaining a little weight? That would be interesting, though, to have her get pregnant against the odds. It has happened to women who thought they couldn't get pregnant!
Not me, though, unfortunately!