what do eggs look like before they hatch?

could you guys be a help and maybe provide pics or give me a detailed description on what to expect when eggs are about to hatch? i've had a single pygmy egg that i took from my girlfriend that has been in an incubator for the last few weeks. the egg was laid a long time ago, and has been burried in the enclosure. the egg has started sweating..i guess, and is starting to get darker patches on it, it is still full but looks to have flatten a bit on the top, not deflated though. any help would be great
 
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