I have 4 duck eggs that pipped yesterday through the morning and afternoon. 3 have had 2 pips side by side with no progress for over 12 hours. Is this considered just a pip or unzipping? Humidity is good (70's RH) but membrane is browning (shell is cracked but membrane is not pierced as far as I can tell without messing with them. The guide says to watch for browning but I didn't get a clear sense of what was supposed to happen after. All are still quacking here and there at least. The one with browning also has the shell turning grey in a big patch down the side. The fourth egg has two fairly spaced and very tiny pips. Not the volcano look like in all the pictures and the others, just teeny chips up. Barely noticeable. Is this what was meant by erratic pips without progress? This one also has not made any change in over 12 hours. Please help! Thanks!