My best guess is not fertilized but you could give them a few more days. By the pictures. Air sacks will grow with conditions but dosnt mean theirs babies growing. First year can be so hard. Ganders can be a pain when it comes to finding the target and being fertile when they get there. I have raised production Africans who are Simulator to Chinese in growth rate and fertility. My boy back them managed to get about 1 out of 6 eggs fertile it was him and 6 girls. But he only preferred 2 girls even then it was a 50/50 on the 2 girls getting finalized. Now I have a bigger hit and miss. All my boys are Dewlap African who dont really hit sexual maturity till there 2-3 plus years. This spring they will be 2. Last spring 1 year and my fertility was about 1 out of 20 plus eggs. Late season I had 8 make hatch I have 4 very incredible girl.s but I must have gone through at least 100 plus eggs to get there between early quite and just not fertilized. But then these guys are heavy weight geese. My production African Girl and her buff boyfriend produced 22 babies. she was 2 years old and he was first year dewlap african who was devoted to her and didnt need a pond to show it... I guess what Im saying is you never know and its all hit and miss till you get a few under your belt.