as cayugad said ; it happends to us all at one time.
that doesn't make it any easier.just check your gun and sights. the load you have should do the job right.sounds to me like a low hit into the leg just below the chest. my wife hit one with her rifle in reg season last year. same as yours very little blood and several pieaces of bone.

it's hard, but put it behind you and go from there.

good luck next year.