I've raised laying hens for 3 y and this is my first time with a rooster and broody hen. A hen has been sitting diegently for 2 1/2 weeks and wouldn't let me come near her nest...today I went in and she wasn't sitting on them so I peeked in and I thought the eggs were reall dirty til I looked closer and it was TONS of pepper size and colored moving critters. What is going on?? I just changed litter and dusted 2 weeks ago...do I need to do more??