I am a married woman, trying to conceive since a year n half. I usually have regular periods every month, but I was diagnosed with hypothyroidism and elevated level of prolactin a month back. Since then I am taking medications for thyroid and prolactin. My periods were due on 3rd march, it didn't come till now. My lmp was 3rd feb, my normal cycle length is 28 days which lasts 4 -5 days approximately. What could be the reason of delay in periods?