Incubating duck eggs? Question?

I am incubating duck eggs and yesterday was only day 2. I know its too early to candle them but the temp. went up to 103 but we got it back down to a constant temp. really fast,less then 5 minutes but I candled the eggs just in case. All the eggs had embryos moving. But isn't it too early to see an embryo moving in the egg,Only day 2 at night? I was also wondering since I have a still-air incubator, does the temp have to be between 99 and 102? or is 102 in a still air only for chicken eggs. I've been trying to keep it 99 to 100. It's been to 100.3 and the eggs are alive though. But is it ok for the temp to be 102 degrees in a still-air incubator since heat rises in a still-air incubator?