i am addicted to coke (the drink lol) and i too was worried when i got pg
i asked my midwives and they said a can or two is ok, same as anyone who has a cup or two of coffee
i had to cut down from abt 2litres to 2 cans a day!
but yeh even baby books say its fine, bit wierd though when they get bigger and you have a can of coke and 5 mins later baby kicks like crazy!
my midwife even said i can have can of coke in labour...what can i say, its my vice! HTH