Because Peeta lied in the interview. All of the tributes were trying to make the Capitol feel bad, talk about rebellion, and show they weren't going down without a fight. Peeta said that so that the audience realized that they were sending a pregnant woman in the games.
the rebelion launched off after the interviews and the audience was forced to leave and go home.
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Peeta announces Katniss is pregnant (but she really isn't) in Catching Fire, the second book, but I don't know what page.
First there a pretend couple, then they're just friends (while their still a pretend couple), then Katniss finds out she really DOES love Peeta, then in the end of the last book Mockinjay, she marries him.
Katniss's talent is archery. When she is hunting, she always shoots the animal cleanly through the eye. Her talent of archery comes from years of feeding her family by hunting illegally.
Katniss is actually an aquatic plant that is also called Saggitaria. The seeds in the center of the flower of the plant are shaped like arrowheads. The plant gets its name from the Zodiac constellation Sagitarrius - or, "The Archer."
Katniss does (Katniss is Primrose's sister)