Leave it!!!!! I helped out to early ( i think) and it died. It might have died from different causes, but I advise NOT to touch it!!! If it is alive it will break out. If it doesn't break any more of the shell in 24 hours, help it out by breaking a tiny hole for it to breathe and see if it is still alive. Make sure there are no other pipping eggs in there when you eventually do help it though! (If it needs help!) Wait 24 hours or maybe even a bit more! As long as it can breathe it doesn't need help!!!!!