Period disturb post fertility treatment.

Continuing my earlier asked query. Thyroid, Proclactin, Sugar level are tested and all fine. I don't have PCOD as confirmed by doctor. First & second cycle ovulation induction: Leterozole and 15 days of duphaston. Period were fine. Third cycle only took leterozole and did not take Duphaston. Did not get my period and there are no pregnancy. Why Period did not come? Is not look like effect of the hormone pills mostly progesterone? Because I have never faced this issue in my life. I know here all will ask to go for a details investigation. I have done all checked and my doctor did not clarify anything and just said take Deviry for 5 days to get period. I have trust on Practo as all doctors here are very friendly and helpful. Please help in this. I strongly feel since I was taking Duphaston for 15 days since last 3 months, my body was used to it. Since I stopped in this cycle, my body did not produce progesterone naturally and due to this brain did not get signal to get period.