If it was stuck to the wall of your enclosure, it may be infertile. I had a leopard gecko do this once and the egg was no good. This could be the case since it was your golden gecko's first egg. Usually they lay their eggs in a moist box/environment to increase the chance of its survival. But then again, you never really know. If you don't have an incubator, I would (that is if you can) take it off the side of the enclosure (remembering of course which side of the egg is facing up), and put the egg in a tupperware with vermiculite and water.(Ratio of 1:1 water to vermiculte) You don't want the vermiculite to be soaked, just damp. Put the egg right side up, as it was on the enclosure in a little hole in the vermiculite. Close the tupperware and either put it in an incubator at 85 degrees F, or just put it somewhere warm (either in your tank, or somewhere that it won't be extremely hot, just warm. That's the best advise I have for you. Good luck, I hope it hatches for you. It's awesome seeing a newborn gecko....Oli
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1.4.8 leopard gecko
2.3.0 nephrurus levis levis
1.1.0 nephrurus wheeleri cinctus
1.0.0 nephrurus amyae
1.1.0 pastel ball python
1.0.0 axantic kenyan sand boa
1.0.0 gargoyle gecko