My eggs are on day 18 and I've been candling every 2-3 days to make sure everything is on track. About 3 days ago I noticed a rotten smell coming from my incubator, today I smelled of each egg and found the one. And its the one that I *think* had two babies in it. When I candled last night I'm pretty sure it was alive. What can I do about this? The smell is really bad.