My last depo shot was 5 months ago and i haven't had a period could i be pregnant?

YES THEY ARE TO BE TAKEN EVEY THREE MONTHS IF YOU ARE HAVING SEX THEN YOU SHOULD TAKE A PREGNANCY TEST IF YOU ARE NOT PREGNANT THEN CHOOSE A BETTER FORM OF Birth Control IF YOU ARE NOT TRYING TO GET PREGNANT ALSO THE SHOT CAN CAUSE A PERIOD FOR SEVERAL MONTHS AT A TIME IT IS POSSIBLE IT COULD CAUSE A LACK OF ONE BUT THEN AGAIN YOU ARE OFF SCHEDULE WITH YOUR SHOTS