"Purring", is not a trait that signifies you have a rooster. "Purring" isn't a noraml chickne trait at all. Do you mean crowing? Hen's can crow as well, usually dominant hens without a rooster in the flock.
Can you get a video of this behavior please? To upload a video, you have to upload it to a video platform such as Youtube, or Vimeo. Then post the link here.
You have a hen, roosters can't lay eggs.