What Could Cause Light Periods And Cramping Sensations?

Hi, I'm 32 and have had a fairly reliable and consistent menstrual cycle since I can remember. If I am stressed or overworked, my cycle may be out by a wk but no more and still comes. When it does, the discharge and flow is always the same. Recently 7 days ago, however I had very very light bleeding spotting (which I've never had in my life) it lasted only for a day and a half not enough to fill a panty liner and not like my period at all. I had very low right side cramping different to what I'm use to and it mostly disappeared when the light bleeding/spotting stopped. It's been a week now and I sometimes still get a tingling cramping sensation not pain but sensation still. Please advise.