It's a Pekin duck egg. It's our first. Honestly, I didn't think it would work. It's been about 4 weeks since my husband and kids set the eggs in a very primitive incubator. I didnt even think they were fertile. Well, yesterday we noticed a little hole cracking, we can hear chirps and pecking. The egg shakes from time to time. Honestly, Im terrified. I do not know what to expect. Its been now about a day and the hole/crack is not getting any bigger. The chirps seem stronger. How long the hatching should last? Should I be worried that there is still no progress?