Is it normal that my period only lasted for 3 days instead of 5 after outercourse (dry humping with clothes on)?

Sounds ok: 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 or two of these symptoms doesn’t necessarily mean there is a medical problem, but a visit to one’s primary care or Ob-Gyn doctor is a good idea if symptoms are causing a patient to worry a lot.