Keep us posted
Hope they are just late
I have had them hatch days after due date
I have also had a few batches take 3 days to all hatch
Warm and cool spots in a bator can affect this
As long as there is no external pip you can go ahead and lift the lid to candle
I don’t open mind fully just enough my hand can go in and candle in place
Also look for bruising on the egg in case they are trying to pip the wrong end. Feel under the egg for any cracks they may have made you...