What Are The Chances Of Pregnancy Having Delayed Periods And Taken Duphaston?

hi,i've taken ovulation induction treatment & was taking letroz tablets 4m 2nd day of my periods. then my doc suggested me ultrasound scan on 11,14 &16th day. my ovulation was good &she given me hcg injection &when follicle ruptured she prescribed duphaston tabs for 15 days & told me to wait for 3 days after taking tabs &if i don't get periods in 3 days then do a pregnanacy test. So today is the 8th day(after taking duphaston course) & i havn't got my periods yet &i havn't done pregnanacy test also. So is that likely that i'm pregnanat?