Have you candled the egg to know that it was fertile and developing? Carry it into a dark room, flashlight against the egg . If clear or murky, dump it and take care of the chicks--they will need food and water now, and the hen may stay on that last eggs, if you take the chicks. Did you listen to the egg? Pecking or peeping? If nothing, forget it, 5 chicks would be fine from purchased eggs. Good luck.