I agree that first light would be better for tracking.. I am not sure if you hit the heart or not. But a deer can travel quite a ways if it was pursued directly after the shot was made. In some cases it will just run until it falls. Yes a deer will circle at times to see what had happened or to find some thick brush to lay in. Also I have founs some deer to pull the arrow out of itself with it's teeth. That will increase the blood flow and surely slow the deer down quicker. While circleing look for deer tracks with it's toes spread apart. The do this alot of times up here to try and keep balance.. Good Luck on finding your deer..