I've only seen it yawn twice since I got it, and both times were when I kind of woke it up to check on it.
I figured it just wasn't eating because it's not used to its new home, since I've only had it for a week and a half. I tried to feed it again, and it was completely disinterested in the food, it wouldn't even look at it, and actually avoided contact with it. Should I take it back to Petsmart, since it still is under that 14 day thing, and I spent the money expecting a healthy snake?