a secondary effect of clomid is that it regulates your cycle because it induces ovulation which after ovulation if there is not implantation of embryo the egg dies and corpus luteum disintegrates and the progesterone levels drop as a result of corpus luteum and because of the drop in progesterone it triggers the lining of the uterus to shed leading to menstruation. Hope this helps. I am an RN and this is what I remember from doing research. I am starting clomid this cycle for the same reason.