Treatment order of prescribed drugs for Gonorrhea

Patient: I’ve contracted gonorrhea and will not have access to ceftriaxone for a few days. I do however have access to doxycycline. I know that the order of treatment is typically reversed, a shot and then the pill regimen, but can I begin with the doxycycline now and then have the shot? Or is it best to wait?

Symptoms: Discharge, burning during urination