Today is day 28 for my Khaki Campbell duck eggs (and day 21 for some chickens). Yesterday morning all six duck eggs pipped. This morning it looks like they have just expanded their pip a tiny tiny bit or double pipped (nothing has changed in the last two hours). Three chickens pipped and hatched last night, and a fourth is currently hatching so I know my humidity and temp. are ok. I know ducks take a lot longer to hatch but I am worried the egg shell is too hard. Their mother lays really tough shells that take a good whack to break open. Should I try to open the pip a little?