My temperatures have been pretty steady at 100 to 101 through the first 6 days of incubation. I candled all 9 eggs last night and I could see embryos and blood vessels in 3 of the lighter eggs. I couldn't see much in the other eggs because they are dark. Today, I checked the bator and the temp was 99.9. I sat down at the computer for about 30 mins and when I came back the temp was at 107.3 It was not that high for long and I have never seen it go over 103 before. This is a home made bator that has been working well. Will a short spike that high kill off the chicks or is there a chance they will be ok?