Period while pregnant??

Pam
My period is always 30 days apart. This month I was 9 days early. It has been extra light.  And is over in 3 days. Mine is normally 5 to 7 days. Not like me at all. For the past 2 weeks my breast have been VERY sore even to the point that wearing a bra hurts. I have not took a test in a week Bc they always are negative. Is there a possibility that I am pregnant?