Heehee you just stumbled into a source of constant conversation in the forums.
Most chickens sold as Ameraucanas are actually mutt hybrids that are in actuality referred to as Easter Eggers. Ameraucanas are a very specific and highly policed pool of purebreds that you won't run into in your average hatchery. Hatheries do love fibbing though and selling Easter Eggers as Ameraucanas (or Americanas).
The end story is that if you didn't get a special purebred, your bird is an Easter Egger, and will surprise you with her egg-color. I'm waiting for my little girl to lay next month, and it's like waiting to open an Xmas present. The anticipation will kill me! She'll lay anything from a green, to a blue (ooo I hope I hope), to a brown.
Special note though, she'll stick with the color she lays; they don't lay different colors once they've started with one. Thats also another common misconception.
Hope that helps!
