It's day 18 and when I went to check the eggs, I heard a faint chirping noise. Then it sounded like I heard another. A little call and response maybe... So I sat down best to them for a good 15 minutes and listened very carefully. I again heard a very faint chirp. So soft that i might be imagining it. My fear is that I HAVE gone crazy and am now imagining chirping eggs. Is it possible that I may have heard a chirp? Has anyone ever heard chirping on day 18? There are no pips yet either.