well, in my case, the old wives' tales were true -- I was/am craving sour foods, e.g. lemon sorbet, sour fruit sweets (ah, starbursts!) and hated my usual PMT of salty crackers, ice-cream, etc., sour=boy and my scan definitely showed a boy!
best wishes
ps. hate apples at the moment, but am allergic to many tropical fruits (kiwi, melon but not watermelon!), so have hard sour fruit candy to suck on....