Woke up this morning to 4 eggs peeping and each has a small pip at the large end. Humidity is at 75%. But over the last few hours, the pips haven't got any bigger and when I chipped away a bit around the pip the membranes are white. Except for 1 egg which has a small hole through the pip area and it's dark as in no membrane covering there but peeping. Again pip isn't getting any larger. Are they stuck? Is day 26 too early to intervene? I don't want to lose these guys!!! They are Mallard x Rouen Drake. Are they too big for these little mallard eggs? HELP!!!!