I think I missed a second canal and I can't stop thinking about it

Did an endo on #19 last week. Found the MB and ML canals, cleaned and shaped, obturated. But now I'm second-guessing myself. I keep looking at the pre-op X-ray and wondering if there's a second MB canal I missed. The patient isn't having symptoms, but what if it flares up in 6 months? I'm losing sleep over this. Should I call the patient and re-treat it proactively? Or am I being paranoid?