I have two broody silkies. They have both been sitting for 2 1/2 weeks. A nice lady gave me few fertile eggs to stick under them. Unfortunately, two were duds and the fertile was broken. I have a chance to get more eggs to put under them. Do you think I should do it? I have been watching their weight. They seem very happy and content. Is there a high chance that they will quit sititing for that long? Should I separate them into their own crates this time so another egg will not be broken? First timer, so I appreciate any advice!