I agree with this, and it's the main reason I'm doubting the story. She/McCain would have to know the story would see light eventually, and it would be a killer.
Stranger stuff has happened.
Even if the story is completely true, it brings something else to light...
She has already given birth to 4 kids. Women know that each delivery comes faster than the last. By the time the 5th baby comes, it's practically sliding outta there.
IF she was indeed pregnant, she put the kid's life at risk by waiting 16+ hours after water breaking. I mean, what if she goes into labor on the plane? Pre-mature baby with downs... and she gets on a plane? No doctor in America would allo her to do that - except - for her personal doctor, the one she gave a major Alaska post/promotion to, in 2007
If she lacks the judgment to get on a flight with a pre-matrure downs child sliding out, I think it's safe to say she lacks the judgment to run the world behind a 72-year old who has battled 4 bouts of cancer.
Also, this is what Palin looked like when she was actually pregnant, compared to this time, when she oddly didn't gain any weight at all: