Fertile or Dud?

[ThornPython4]

Hey everyone, this morning I found this egg beside my female Gecko. I'm unsure if it's fertile or not since it has a red vein on one side. The picture here shows the vein. Can someone tell me if it's fertile or a dud?

 

[Taquiq]

Looks like a dud but keep incubating.

 

[im faster]

probably a dud.. but keep and eye out for mold the toss it

 

[ThornPython4]

Not sure if this helps, but I found this picture online of a fertile leo gecko egg and it looks a bit like my picture.

 

[Tommy13b]

Looks good to me, whenever you see a bullseye it usually means that eggs good.