Can i be pregnant...? ?

my head has been hurting for 3 days now, i noticed my breast are a bit bigger and fuller but they are not sore, i have had really bad bms but only at night and in the morning, my lower back is hurting, i also am having slight cramping, and im am always so sleepy that i can just pass out at any time. i am not due for my period till 5 more days. thanx