I have a pekin bantum hen that is on the verge of being broody. Another hen is sitting on some fertile eggs and she has decided to join. In the last few days she has developed an odour like no other...it's a fishy rotten smell. All of the eggs that are being sat on are intact and there is no poo in the nest. I have checked her over and she appears to be fine. Has anyone had this before? I even cracked an egg she laid about a week ago and it had the same fishy gross smell. She seems to be well. Please help!!!