HI IM 18 I HAVE HAD A DEPO SHOT IN MARCH 2012 I DIDNT GO FOR ANYMORE I DIDNT GET A PERIOD TILL THE END OF OCTOBER I GOT A PEROID FOR ONE DAY AND THEN A FEW DAYS LATER ON THE 2ND I GOT A TWO DAY PEROID , I HAS UNPROTETED SEX ON EARLY MORNING 22ND NOV HE PULLED IT OUT BU SAID HE DIDN CUM...,NOW YESTERDAY I STARTED TO GET A BIT OF BROWN DISCHARGE BUT TODAY ITS FILLING A PANTY LINER AND IM HAVING MILD LOWER BACK PAIN AND MILD CRAMPING, I NEED ANSWERS, COULD I BE PREGNANT