Is Bleeding After Coming Off Duphaston Normal?

i am 28yrs old 1 n half yr of marriage trying to conceive,my doc prescribed me ovi-f 50mg bd for 5 days n duphaston 10mg for 15 days nw after 2 days of stopping duphaston i ve sudden bleeding.nt very heavy.i ve short cycle n have done my hormonal profile which says FSH 10,Lh QE n estradiol 35 on 2nd day of my period.ultrasound normal.