Is it true that women who are pregnant and crave pickles may have low iron?

Maybe a coincidence: Some women who are pregnant crave pickles. Some women who are pregnant have low iron. That means just by coincidence, there will be women who have both. But, not all women with low iron will crave pickles, and not all women who crave pickles will have low iron!

May be: Low iron and pregnancy are both associated with pica, desire for usual foods and other substances like ice and dirt.