Opk positive a day before af due... Confused

mini
Hi ladies ,I've been having strange pinching feeling not like my normal AF cramps so I taught maybe I am Oing again?? I took a test and it looks positive but AF is due tomorrow so I'm totally confused . When I sneeze its almost like I've pulled a muscle I hope this is making sense . could this be o again is my cycle that messed up ?? Any ideas??