Our hen has been sitting on eggs for a full 24 days now...any suggestions on at what point I should pull the eggs? One egg (out of 4) appears to have been either pecked at or otherwise damaged from the outside and has a feather visible but no signs of life and nothing at all from the other 3 (I did not candle them). Mama hen left the nest infrequently but one time for over an hour so not sure if that either delayed or stopped development. Thanks for any input!