COULD i BE PREGNANT

I TOOK THE DEPROVERA ON THE 17TH OF DECEMBER BUT HAD UNPROTECTED SEX EARLIER THAT MORNING (STUPID I KNOW!!). I USED CONDOMS FOR THE FIRST WEEK WHILE ON THE DEPO WHILE IT TOOK TIME TO WORK AND WAS BLEEDING AND HAVING THICK BROWN DISCHARGE THROUGHOUT MY TIME ON IT. I WAS DUE TO HAVE THE SHOT OF DEPO AGAIN ON THE 8TH OF MARCH BUT DECIDED AGAINST IT AS I WAS FED UP WITH THE BLEEDING. ITS NOW APRIL 17TH A MONTH LATER AND IM SURE I CAN FEEL KICKING. THIS MUST SOUND BAZAAR AND IMPOSSIBLE BUT IVE BEEN PREGNANT BEFORE AND RECOGNISE THE FEELING. IS IT POSSIBLE THAT i CONCIEVED THE MORNING I HAD THE SHOT???? IF SO WHY WAS I BLEEDING?????? I KNOW THAT A DOCTORS APPOINTMENT WOULD RESOLVE THIS ISSUE BUT IM WORRIED IM OVER REACTING. IS IT POSSIBLE THAT I WAS PREGNANT WHILST ON THE DEPO. SOMEBODY PLEASE REPLY.