Hi i have a cheapish incubator and the turning nob for the temprature is not perfect as it was damaged in posting i had the eggs at 37 nmost of the time but the last half of the hatch it have been up to 39 i dont realy want to try and change it incase i doe it too much either way and loose the chicks they have been makeing progress at this temprature but im on my last 3 days now will they be ok or is this serious?