if you are that worried about it double check your incubation medium moisture level.
the eggs DO stretch tremendously. depending on the original size of the egg, and the size it gets before hatching, there can be faint marks that just look like stretch marks, or actual cracks in the surface of the egg. these 'cracks' ( which are just really big stretch marks) can be on the bottom most commonly, but sometimes will even be along the top of the egg.
the egg will almost triple in weight most of the time before it hatches if it is subjected to the correcty humidity requirements.
here's the top of an egg about to hatch

and here's the bottom side of the egg

if it looks like these and they are not moldy then they are fine.
this is a pretty extreme case of stretching too.

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• Something wrong with my eggs.........................????????????? - lazandlouie, Fri Feb 17 00:37:46 2006
• RE: Something wrong with my eggs.........................????????????? - flamedcrestie, Fri Feb 17 11:51:47 2006