I had period last an extra day could it be a no big deal or is it something bad ?

It happens sometimes: Many women have occasional variation of their mucus discharge, some spotting between periods, a heavier period, a lighter period, a longer or shorter period, or even a missed period. Having one of these symptoms doesn’t necessarily mean there is a medical problem, but a visit or a call to one’s primary care or Ob-Gyn doctor is a good idea if symptoms are persistent, recurring, or worrisome.