worried 😯

Since finding out I was pregnant, did everything to the code, quit drinking, slowly but steadily quite smoking cigarettes ( have quite completely now), have made sure I've done everything correct.. What worries me, is today, had massive cravings for soda and before I had realized how much I had actually drank, I had about half a liter of coke... Is that enough to hurt a baby in early pregnancy? ( 6 weeks 5 days)??? I'm actually a little scared... This is even the first time I've really had any caffeine since finding out, stuck with water, and slowly wiened off the soda, just today was a serious craving day.