can a low temperature in my incubator delay my hatch day

[TwoCrows]

No I didn't loose power.. was on university anx as I came back it was on 35C could be 7 hours and the other day it happened again.. perhaps it coeld be the temperature outside that fell so much.. and then I had problems with the incubator which had some problems holding temp at 37,5..it's still air.. it jumped from 37C to 38,5C but I don't really know how logit was on 37C! Sadly I think there were many periods when the temo was longer (some hours) just at 37C...
That are my babies on day 21 with air cells marked..

As you see on the termometer temp was down again but just one moment because of the foto I took..

All you can do is get the temp up and wait this one out. A few hours here and there will probably not delay the hatch more than a couple of days. Try to keep it steady from here on out.

Good luck!