Could i be pregnant? please read!!?

THE FIRST DAY OF MY LAST PERIOD WAS MAY 27, 2007. I HAD SEUAL FOR A COUPLE WEEKS AFTER MY PERIOD, WHICH MY PERIOD USUALLY LASTS 6-7DAYS. I BEEN FEELING SICK N' PAIN IN MY STOMACH I HAD BLED (SPOTTIN) FOR A DAY LIKE A WEEK AGO...IM 4 DAYS LATE FOR MY PERIOD WHICH NEVER HAPPENS. N' WHEN I DID HAVE WE DIDNT HAVE PERTECTION. LIKE A COUPLE WEEKS AGO I DIDNT EAT AT ALL N' NOW I JUS CANT STOP...IM ALWAYS TIRED...PLZ. HLP