What Causes Morning Sickness And Sore Breasts After Menstrual Cycle?

i started my period 2 weeks early this month, before my period started i had very sore breasts and i spotted lightly before, then my period ended about 3 days early then spotted for about 1 minute 3 days later. i felt sick this morning, my stomach was just upset, i felt like i was going to puke but i did not. what is wrong with me? could i be pregnant?