Is Light Blood Discharge On Day 3 After Taking Duphaston From Day 15 To 25 Of My Cycle For Spotting Normal?

Hii...i am 25 years old and married and i am having pcod... i went to doc because of my spotting issues after my mensturation and currently on treatment with duphaston 10mg once a day for 10 days starting from 15th day of my period to 25th day...today is the third day and i am experiencing light blood like discharge...is this normal will it change as bleeding before i finish the course of tablet