How much salt is too much salt?

All I'm craving is salty stuff and sprite... I add salt to my food and just ate some fabulous potato chips and now my fiance is going to McDonald's ( I know, ew) to get me a chicken sandwich. I just had the sudden fear of having too much salt in my diet. Any pregnancy do's and don'ts that say somewhere not to take in too much salt (for anything other than the swelling roo much sodium causes) I worry about it harming my baby developmentally. (Even though I'm probably not taking in that much sodium as I think )