This is my first year raising chickens. All of my chickens are still young except I bought 2 hens about 3 weeks ago. I've been getting about 3 eggs a week between the 2 girls and today was actually the first time an egg was laid in the actually nest box, instead of the coop floor! But since about 3 hours ago one of the hens has been sitting in the nest box and looks to be pushing. Her vent is facing out and I took a video that I can upload if it will help. My question is, is this normal hen behavior? When I looked in the coop, I thought she was probably about to lay, so I gave her privacy but she's still there hours later and it's the pushing motion that has me concerned. Should I be worried? Is this a sign of being egg bound?