Do you see development?? They have been in the incubator for 7 days. I swear I can slightly see something. This is my first time incubating, if you can’t tell lol. My light isn’t very great, and I can only see through 2 of my 9 eggs.
Looks like veins to me. You might find you get a better view if you candle from the other end of the egg or try moving the light around to different spots.