. It is an estrogen
analogue that allows for the first part of the menstrual cycle. This is the hormone involved in maintained the growth of the mucosa of the vagina. Thus, your doctor is actually trying to heal your vaginal mucosa. It is expected that you will not have periods as the estrogen prevents ovulation and thus stops the progesterone
induced shedding and bleeding. If you are concerned you may ask your doctor to change your medication. I hope this helps.