My parents blood type is b and o i'm am rh a negative is thi possible?

Are you saying you are A negative? I don't know how this would be possible. If one parent is type O, then genetically they would be OO. If your other parent is B, they would have BB or BO (where O is recessive). I don't think there is a way to be A w/o one of your parents either being A or AB blood type.