if theres a certain breed of chicken your looking for. chick out this site. for most of the breeds they have a link that will possibly have fertilized eggs for sale. i you want it....
check it out--> https://www.backyardchickens.com/web/viewblog.php?id=2658
if the chickens feathers were shiny at 5 months you would be able to tell is it was a roo or hen.
roos have shiny feathers. so they are hens. YAY YOU!!!