Normally menstruation happens because of the shedding of the uterine lining following demise of the corpusluteum which is the structure of the ovary produces progesterone hormone. So whenever without confirming pregnancy if you give progesterone injection i.e.dydrogestrone and HCG periods tend to get delayed. Progesterone doesn’t allow the uterine lining to get shed and the HCG injection maintains the function of the corpus luteum continuing the production of progesterone thereby preventing shedding of the uterine lining. So these two medications has to be prescribed only when pregnancy is positive not negative. So it may not cause harm but it is waste of time and money.

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