this is different

so last month my period ended on the 12th of august. my husband and I are ttc. normally I don't get any period symptoms until about 2 weeks beforehand. but this time around my breast were sore and I had backaches and a little cramping roughly two weeks after my period ended in august. and to this day (Sept 13) my breast are still sore but I don't have backaches or cramping...? does anyone have any idea what this means??