I'd love to see your pink egg photo.. Honestly a lot of people have their own opinions of "pink." I myself have some Jersey Giants who lay a consistent pink colored egg, but in all reality it is just a pale brown that has a blushier shade than any of my other pale brown egg layers. And then, of course, there's the other kind of pink - The kind you can wash, and it disappears, then comes back when dry. That type of pink can pop up in any brown egg layer, and even be purple in dark brown egg layers. It isn't really a breed specific thing, but usually just happens every once in a while to young layers. It is caused by an extra layer of blume over the egg, which coats it a thin layer of white, and causes the egg to appear pink. Now, there are some instances, though, where this trait carries on through the hen's life, and even past her young age it will pop up.
If my Araucanas laid brown eggs, not blue - They'd lay pink eggs all their life, as they have a thick blume on their egg every single time.
And in dark eggs, it makes them look plum-purple. Here's a carton of different colors, one here is my "pink" Jersey Giant egg and one is my plum-purple Marans egg, which doesn't occur very often, but if it does, it is a trait that particular hen carries, and she will lay it once every ooh 3-5 eggs.
What breeds do u have