Every shot can't be perfect. I know that feeling of anguish that overcomes you when you realize you haven't gotten a good hit and the animal is going to live longer than you'd have wanted. It's part of hunting. It happens to all of us, so don't worry about it. We all want to make a good shot and don't want the animal to suffer, that's why we practice and wait for the best opportunity. You showed great knowledge by reading the sign on your arrow and the lack of a blood trail, great patients by backing out when you needed to, and great determination by going back to collect your doe. You deserve to be commended for that. Good job.