That temp shouldn't make incubation start. I set some eggs from my birds on the 27th. I always count the day set as 'day 1'. So far I have 7 hatched. Regardless of when day 1 actually started, they are still 2-3 days early. I know it's not the incubator because nothing else is hatching early. Coturnix take 16-18 days so I guess mine just didn't want to wait