If you're getting periods now, and feel that your T levels are too low, your endo should check your levels, because if menstruating is a change from the norm, it should always be investigated, and even if it isn't, it is not ideal, and obviously your dosage isn't doing enough for you. Our doctors are supposed to keep close tabs on our levels at all times, so that we get the most out of HRT while staying healthy. If you make that argument, perhaps she will come around to the idea.