So my Jap hen hatched 3 chicks 3 days ago, but there are several more eggs that are dark with chicks in them. She nests on them with her chicks, but not 24/7 to actually hatch anymore. What do I do?! Should I crack one open((how do I go about doing that))? Wait? Put them in a box with a heat lamp and a cup of water((I don't have a incubator, won't buy one til later))? Help!