Can a person who found out there prediabetic in september and has been eating unhealthy for the past 2 months develop diabetes in that 2 month period month frame ?

Possible but...: Basic science re prediabetes vs diabetes: Prediabetes; Hemoglobin A1C level 5.7 to 6.4, Diabetes 6.5 and above. However, individual lacking clear symptoms of diabetes, should have a repeat test on a different day using the A1C test or other diabetes tests, e.g., fasting blood glucose or oral glucose tolerance test to confirm the diagnosis.