A lot of doctors will not do anything unless you go into their office with an appointment. Often, this is for billing / insurance reasons.
My initial prescriptions were for short times: one month, two months, three months at a time. Now, I am up to six month prescriptions. Two weeks before the prescription runs out, I get my blood drawn for lab work. Then a week before it runs out, I go in to see my doc. She reviews the lab results and makes any adjustments in my dosages. She would never renew a prescription without an office visit, and would certainly never make an adjustment without a visit.
So call up the doctor's office and make an appointment to discuss your lab results and possible adjustments in your prescription.