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Might be too young still for the egg spot but has more female shape than male. It's origin is Cambodian variety but now they are so mixed that it has multiple color forms as part of it's make up. It appears to just be a plain old Betta splenden, gender unknown at this point.
You sure they were egg spots? 1 week old fry seem awfully young to be having eggs when they don;t start breeding until about 2-3 months of age. Either way, this fish may have come to the store soon after being bred which could also explain why no egg spot.
Another way to confirm gender would be if this fish blows a nest. If it's healthy, and male, it should do that. Good luck