How long has the didrogone tablet eaten to come menstruation

Area progesterone generally eat ten days in a row, stop three to seven days after menstruation. But the premise is that the time with progesterone to be long enough. If seven days after the cessation of menstruation has not yet need to find further reasons, first of all is not long enough to cause withdrawal bleeding time delay. Also, there is no possibility of pregnancy, because pregnancy after taking medicine has the role of fetal protection, after stopping the drug is not menstruation. There are ovarian failure, estrogen levels in the body are not enough, even after taking the drug will not come menstruation. Therefore, we should actively find out the cause, and then symptomatic treatment.