confused

:huh: okay, my period was suppose to start on april 6th and it started exactly a week later, ive been having unprotected sex for the past couple of months with my bf. when i got my period it was very very light and only lasted 2.5 days. which usually it lasts from 5-7 days, ive been cramping alot ever since and it wont stop, headaches, bloating, and grouchyness.. crying over everything,and nausea. could i be pregnant???
thanks, ashley