That could the final 'drawdown'(I think that's the term) of air cell, happens when close to hatch. I've never seen it in person as I don't candle after day 18.Since I first posted, the air sac has grown drastically and is lopsided. It extends much further to the right than the left.
This is the hardest part, waiting for those pips to show.
Do you only have one egg in there?(too lazy to read all the way back thru
