I haven't had cravings for weird things and I haven't had on going cravings but I've had a couple of times where I've just had to have something, eg when through two weeks at about 15w where I would go through chocolate milk like crazy and then at about 22w I craved cadbury creme eggs for about 2 wks. Cravings are a funny thing, but are as individual as each and every pregnancy is.