Ok, so I think it was a cuckoo maran laying the pink eggs (by process of elimination). I also had a pink egg hatch in the incubator today! It came out black. The daddy is a dominique, so I guess it would be a cuckoo dominique. Which really isn't too much of a stretch...
It was my first time using an incubator so I just used eggs from the girls, they are almost all crosses. I just had to try it out to see if I could do it, and we needed a few more birds in the freezer.