Problems with Eggs?

[BackwoodsMomma]

Hi all. I am new to raising chickens. Our neighbor gave us 2 hens( 1 is a topknot, not sure about the other) anyways we put one of our roosters in with them ( a Beautiful Easter Egger) Sure enough she/ they accumulated 15 eggs before they both began setting on them,( they have always shared a crate and still are). Today, however when i went to feed them they only had 13, there was one on the ground with a hole in it, and I'm not sure where the other one went. Is this normal? Are they like dogs or cats and can tell if something is wrong with one and push it out? Our rooster is still in with them but never bothers them.. she makes a funny noise when you get near her also ( I'm assuming a warning..lol). They have been setting for 1 week today and by my calculations we are due little ones around the 11th or so of May. Any input would be much appreciated. Also if you need more Information just let me know. Thank You

 

[A Chicken Owner]

Broody hens sometimes know if there's a bad egg and they will push it away so that's probably why there are less eggs