I'm really scared I'm going to stretch out my band or pouch. How likely is this? Also what causes it?

The band does not stretch.

Stretched pouches that are diagnosed tend to be linked to overeating.

You are a new bandster correct? If so chances are you dont have any restriction. It is really impossible to stretch out your pouch if that is the case.

Overeating is what can cause the pouch to stretch. Eat small portions as instructed by your doc. Carbonation can also cause the pouch to stretch so no beer or Diet Coke. That is hard part for me.