Hi, don't worry this is normal! Chicks have timetables just like us some will hatch late and sometimes chicks will hatch early! If you can hear the chick chirping that's really good, I know this sound crazy but try to be like a mother hen chirp back to the chick so it feels safe! Also what incubator do you have as a incubator (what brand and model) and how many eggs do you have in the incubator of which breed? If your incubator temp is a bit low the chick might hatch a little late but if it is high it will hatch a day before! Your incubator temp should be at 37.5 *c can you tell me what it is? And if it is possible could you tell me what your humidity is at as this will help me figure out the problem! :/