Why Are Menses Delayed While Trying To Conceive With Assistance?

hi there, Ive been ttc for 1 n half yr now. By history im PCOS & hypothryroid. Im on thyronorm 125 mg, Bigomet 1500mg. This cycle i was on clomid 100mg & also given Hcg injection 5000mu on the 16th day (monitored by follicular study) had intercourse too , as sugested by doc. . My doc also put me on duphaston10mg from 19th day onwards for 10 days. my periods were expected on 18th Mar. My doc had told me duphaston will helpme hold the pregnancy, & if ive not concieved i will get ma periods. i havent got me periods yet, today 20th March took a home test ystrdy, was negative. By when shud i have got my periods after being on duphaston. ?? do i seem pregnancyt this cycle???