Period or pregnancy

Last few days I have been have dull pain on my sides. 2 days ago it was on and off on my right side but yesterday it was my left and lasted longer. Both day the pain went to my back. Last night I had light nausea. I have had a slight cold for 3 days. And my breasts are not super sore but one day my nipple were but my areolas have no gotten darker or anything. Also the sides of my breasts are sore but not super sore. What does this mean.. anything or nothing.