I Began Having Menstrual Like Cramping The Day My Period

I began having menstrual like cramping the day my period ended, about 3 days ago. It was very uncomfortable and seemed to be better if I urinated or passed gas but would return. The pain would wake me during the night when I changed positions. This morning after a bowel movement it changed from a crampy feel to a sharp pain just above my pubic bone if I press there. I am 42 and have always had a pretty normal menstrual cycle. There is no pain with urination.