We have an incubator and my aunt gave us some brown ferilized eggs to hatch. I have kept the temp right at 99.5. I have kept plenty of water in the little water places inside the incubator. My aunt came over and candlelit them. We can see a large dark mass inside the eggs. The shells have gotten so that there are dark spots (almost looks like the shell is thinning out). We used this thing she brought to listen to them and we could hear what sounded like scratching but I am seeing nothing. No movement-no sign of cracks or anything. What could be going on? Is it normal for them to be on day 31 and still not be hatched? Should we try to carefully open one? Is it too moist in there? Any suggestions would be very helpful.