Could being on augmentin (amoxicillin and clavulanate) for 6 days have prolonged my period.. usually have 6 day flow but this month it is 8 days and still seeing little blood .

No...: Augmentin (amoxicillin and clavulanate) will not affect your cycle. At the age of 52 if you are having abnormal, prolonged bleeding, then this should be evaluated as a completely new problem. You deserve an exam and an ultrasound to evaluate further. For additional information, please visit my personal page @ www.Obgynhelp.Com.

Prolonged period: Yes your infection or Augmentin (amoxicillin and clavulanate) could prolong your period, however with a little time should return to normal. Ask again if this does not resolve soon.