What does squatting look like? What does the egg song sound like? My one 15week old girl has started to bend down in a squat position if I try to pick her up. She hasn't done that before. Also, she has just started to get extremely loud in the morning for a short period of time but it's so much bawking.
The squatting is the submissive position the hens give to the rooster. They tend to get more vocal & practice squatting as they're getting closer to laying their 1st egg. The combs also get red. It may still be weeks away, but you'll want to get nest boxes ready. It also helps to add a golf ball so they know it's a safe place to lay.
As far as the egg song, you'll just know. Kind of a loud "Ba Ba Ba BAWK" repeated several times....The hens are so proud & make quite a ruckus. (The first time I heard it, I went running to the coop in fear there was a predator attack. One hen started then they all joined in. Even the rooster!) There's plenty examples on Youtube . Some hens are quiet, some always make a big deal.