What to do if you crave alchool during pregnacy?

i am 18 weeks pregnant, and have been craving a beer! i don't know why, because i have never liked beer. i don't drink one, even though i'd like to. i just think about my little baby growing inside of me, and how i wouldn't want to risk any defects on my baby. in some countries women do drink alcohol during pregnancy, but i would rather be safe than sorry.