Katniss does not find out in Catching fire, but in the first book, when they are in the cave by the river.
No.
no they do not
Peeta
No, but she does in Mockingjay.
Katniss does what Haymitch does
Still Katniss Everdeen.
Yes he does. In Catching Fire Gale reveals that he loves Katniss.
Fire is catching, and if we burn you burn with us!
Katniss being preganant
Yes, Peeta and Katniss participate in the Games in the book Cathing Fire.
Maggs and Finnick