depends
if kampung organic egg, high possible chances its fertilized - kampung free range chickens, where chickens roam around and mix (got male cocks around)

but if you buy omega etc - those chickens usually dont mix with males one - so eggs are not fertilized

quail eggs - burung puyuh - high chance its fertilized because very hard to differentiate males vs females .. sometimes in a cage of 20 females, got 1 or 2 males inside

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for eggs to hatch, its not an easy process
1 ) you must make sure the temperature is perfect, warm .. and air is moist
2 ) every 4 - 8 hours need to rotate the eggs
3 ) after day 14 (for chickens, i think, some shorter, some longer) or so - cannot rotate anymore - quarantine time - let it hatch d

most ppl buy an incubator - you can diy yourself with thermostat an you need an egg candler to see whether the eggs are fertilised and developing

if that is the case, then we should be worried d
eating ninja turtle eggs from supermarket shelf

Free range eggs expensive, not sold in trays.

what da fuq
you mean that blind rat been rubbing his balls all over the chicken egg and ninja turtle came out ??

thats so wrong