My Americana looked like she was laying last week but all my eggs were brown. Sunday, all brown eggs. I checked several times so I'm certain there were no green eggs. Yesterday there were 2 green eggs! Is it possible for one chicken to lay 2 eggs within about 20 hours? I do have a 2nd americana but she's only about 16 weeks. I don't think she's old enough to start laying. What do you think?