have question also..I was on duphaston too for 10 days since august 1 2011, but my period hasn t come yet until now.I took PT before i took duphaston and it turned to be negative.Last Aug. 19 after 1 wk. of no signs of period i went for blood/serum PT and it turned to be negative as well,but until now my period didnt come stil.I am assuming that I am pregnant, we wanted to have a child so badly,Dr. is there a possiblility that I am pregnant?by the way i was diagnose of PCOS.please help me clear with these,its so frustrating and heartbreaking if I am expecting but nothing.thank you!