What is this?

[Emily_mae]

Okay so I went and got eggs for breakfast and cracked this one egg open and it has this weird thing in it. We do have a rooster but they are in separate coops(still trying to introduce them togeather) and did have contact about a week ago but I watched them the whole time and nothing happened she just chased him around the whole time. What is this?View attachment 1471274 this came out of the egg??

 

[Chicken-lovebirdchihuahua]

It takes 3 1/2 weeks at most for eggs to be infertile many it was a chick forming?? And they mated when you looked away???