Soft drinks...?

I am a Diet Coke addict!
But since I found out I was pregnant I stopped drinking it and replaced it with Canada Dry Ginger Ale thinking it was a safer choice if I'm going to be drinking pop. 
Starting to try to just switch to water & sparkling water. 
Does anyone know if C.D. Ginger Ale is safe?  I just thought since there's no caffeine be in it and no aspartame it would be ok but maybe I'm being naive