There is a very terrifying smell in my incubator. The eggs have been in for 4 days. I candled and found one for sure rotten (dark when candled) and extra stinky. The rest are all clear and I can't tell if any really smell still because everything just stinks. Is it possible that I missed a spot when cleaning from my last hatch and something is growing? Or is this just all rotten egg? How long before I need to worry about a rotten egg exploding? I'd like to wait another day for any left over stench to disipate, so I can determine what if any eggs are rotten. Thanks for the advice!