The same thing happened with mine, the temp climbed a bit when I put the eggs in. I decided to fuss with it to get it back to 99.5, even though I knew the 99.9 was probably alright, I was just a little paranoid. I hatched silkies, too. They were shipped, though, so I was a little cautious with them. All seven of mine that hatched did so on day 21, none of them had any issues hatching and they are all really healthy, energetic little chicks, I think the incubator did a great job! Hope your little one feels better, my little guy has been sick this week, too

Keep us posted on the hatch!