It looks like a hen to me. I mean I am no expert on that particular breed. If you wanna know if that egg is a fart egg, crack it open. If it has a yolk and a white then it is a regular egg. If it is just the white then it is a fart egg. It is a oops in the process of egg making, if you think your little egg is cute, try getting one from a coturnix quail. It was the size of the tip of my pinky SO CUTE! But I think that you have a hen there. I mean all signs in feathering and coloring point to roo, but there have been weirder things that have happened. So crack open that egg and see what you find!