How bad can caffeine be?

During my first 8 weeks I was drinking non stop soda. Maybe like 2 glasses a day no joke. I can finish a 2 Liter bottle in a week by myself. I was drinking those cheap Cola bottles and Citrus and Orange soda. I guess I was addicted. But how bad can it be for a growing baby? I recently stopped and changed to having fruit smoothies instead for my sweet cravings. Can someone please tell me if I harmed the baby?