my first chicken egg pipped sometime between midnight and 6 a.m. Saturday morning. Since then the only progress that it has made is break through the membrane and stick it beak out. It has been well over 24 hours and it just keeps its beak out open and closing it and peeping on occasion, to my knowledge it has not tried to break out anymore. Is this unusual or is there a problem? Really would like some advice please. two other eggs has just pipped today. today is day 21 Thanks.