I am new, day 20 on my fist hatch, so I don't know much BUT I have done A LOT of reading on here & have seen story after story of eggs that have hatched "against all odds"... High temps, low temps, power outtages, humidity problems, cracked eggs, you name it!!!!
So you absolutely, positively, DO have hope!!!
How many eggs & what kind? Just curious!
You really SHOULD get or make a candler... not just to check on them because of the temp spike, but just to see them in there - it's INCREDIBLE!!
I got a little LED flashlight, I think it was less than $6, it works GREAT!!! I like the LED lights because they don't get hot, PLUS they are SO bright- I could easily see what was going on in there, even though it was my first time trying.
You don't have to do this, but I also put a piece of foam "pipe insulation" (NOT fiberglass!!) around the end of the flashlight, to cushion it a bit & keep from bumping/tapping the eggs... I was paranoid I was going to crack one. Basically the pipe insulation is a tube, I cut off a 2 inch piece, the middle of it is hollow (so it looked like a foam "donut") & slipped the "lit" end of the flashlight down into it. Was really simple to do but I don't know if I am explaining it very well! Have also seen people use cloth (flannel) across the light & just secure it with a rubber band, cut a hole in the cloth so the light can shine through; makes a nice cushion between egg and flashlight.
Lots of other ways to do it, too... if you use "Search" for this message board, just type in "candler" or "candling"!
Good luck!! & welcome to BYC!!!