I have a Plymouth rock who is 5 months and about 3 weeks old, I was told it should take her 40 weeks to lay however today she has laid her first egg and it didn't seem like the easiest thing for her to do. She was in and our of the hen house all day, and then as the day progressed so did the volume of her voice, then half an hour before she laid the egg she made the loudest noises I have ever heard a chicken make, like she was distressed and in pain. So at this point I started calling vets and they were concerned she might be egg bound. After half an hour in the coop with complete silence she finally laid a little egg, afterwards her combs were quite light in color, light pink and some parts even lighter, so I gave her some water then she made more very loud distressed noises. After a while she did come out of the coop and start picking at some scratch and had some fresh water I laid out for them. However I am a worrier so wondering why she would lay so early? Have I done something wrong? Can she possibly be a distressed each time as she is in pain as she isn't fully developed? Don't know alot about chickens, please help!