I get an occasional craving of soda but you should try to use organic brands or at least real sugar so for pepsi, use pepsi throwback although I dont think coke has one that is natural.
Drink coke and its fine limit the amount but you can have it with my first pregnancy they insisted i drink one can a day because i had a caffeine migraine for 3 months before they figured out thats what it was i say two is my max now then i drink water and juic3