AM I REALLY PREGNANT

I WANNA KNOW IF IM PREGNANT.... I LAST CAME ON MY PERIOD JULY 2, 2008... IVE BEEN HAVING SEX WIT MY BOYFRIEND, UNPROTECTIVE... I TOOK A PREGNANCY TEST A WK AGO, AND IT SAID NEGATIVE, BUT I THINK IT WAS TOO EARLY TO TELL....ITS IS NOW JULY 31ST AND I CAME ON.... IM BLEEDING BUT IT IS VERY LIGHT... I NEVER HAVE A LIGHT PERIOD (UNLESS IF IM PREGNANT, I GUESS), IT IS ALWAYS USUALLY HEAVY... IVE EXPERIENCE CRAMPING REAL BAD FOR THE LAST TWO WEEKS... IVE BEEN VERY TIRED, AND SOMETIMES NAUSEATED BUT NOT AS MUCH... IM VERY SENSITIVE... IVE BEEN CRYING A LOT EVEN IF LIKE IM WATCHIN TV, I CRY... IVE BEEN PREGNANT 2 TIMES IN THE PAST... I REMEMBER I HAD A LIGHT PERIOD TOO THEN... IT WAS EVEN TO THE POINT WHERE I DIDNT FIND OUT I WAS PREGNANT TILL 3 MTHS LATER... WHEN I WAS 3 MTHS, I THOUGHT I WAS REALLY 1MTH... I JUST WANNA KNOW IS THERE A POSSIBILITY IM PREGNANT???? %-) :$ :-(