Hi, how many eggs are you incubating? are they your own or someone elses? were they shipped? how are you incubating? sorry for all the questions! but I would have expected to see more on day 7 can you make out any red veining at all? any embryo? you should be able to see it moving too, I would not worry so much about the air cell unless they were shipped, it should be visible at the blunt end if you shine the torch there but becomes bigger as incubation progresses, 7 days it is still relatively small, I would get a brighter light as suggested it will make it so much easier for you to see led flashlights are great.