We had one of these too yesterday, think it's just the egg season kicking off, also had a HUGE double yolkers, but should settle down soon!!

"No-yolkers are called "dwarf", "wind" [or, more commonly, "fart"] eggs.  Such an egg is most often a pullet's first effort, produced before her laying mechanism is fully geared up.  In a mature hen, a wind egg is unlikely, but can occur if a bit of reproductive tissue breaks away, stimulating the egg producing glands to treat it like a yolk and wrap it in albumen, membranes and a shell as it travels through the egg tube.  You can tell this has occurred if, instead of a yolk, the egg contains a small particle of grayish tissue. In the old days, no yolkers were called "cock" eggs. Since they contained no yolk and therefore can't hatch, our forebears believed they were laid by roosters."