I had the occassional regular coke to settle my tummy with m/s (worked wonders btw! Don't know if it's the fizz, the caffeine or what). I avoid artificial sweeteners too. But I avoid them in general anyway regardless of being pg or not. DH drinks diet coke, and I don't like it. I'd rather him just have natural sugars.

I read in my nutrition book that it's best to stay away from caffeine, but if you really can't go without, one drink a day should be ok. I couldn't resist an English Breakfast tea the other day. Felt guilty afterwards tho! lol. I pictured the poor bubby's heart racing away with the caffeine.