Let me be the voice of reason here. This bite and rash were 2 and a half years ago? You didn’t see a tick, either, right? Do you have any symptoms now, like joint aches or generalized fatigue?
Basically, what I am trying to say is that if you live in a low probability area, and the event was more than 2 years ago, and you don’t have any symptoms, then I doubt highly that you have lyme disease. Even chronic lyme symptoms manifest a few months after the bite. Be wary of any blood test results, either way.
Note: I am an Infectious Disease doctor.