That's because word had gotten out in Wasilla, where it was common knowledge. But you seem to be changing points. I asked (twice) if she was so obviously pregnant, why did the lefties decide that she was Trig's mom?
Because they are crackpots, I do not think that it was necessary to address that question.
Very much like those who believe that Hillary is a lesbian that had affairs with Web Hubble and Vince Foster.