Dollar store test BFP 1 week before AF

Ca
My first prenatal appointment is tomorrow, but I'm so impatient!! I want to ask my doctor why I tested positive so early (dollar store tests, first response, and clear blue) and what that means! I even tested positive 5 days before AF in the AFTERNOON on a clearblue and the box statistics only had 51% accurate for 4 days/fmu. Advice??