the duphaston prescribed to you should be taken in cycles of 10 or 21 days with next cycle starting from ur first day of period ...its a relatively safe drug and in PCOS it helps in maintaining progestrone
is recommended in the treatment of infertility
for several reasons:
it has no inhibitory effect on ovulation
it does not alter the normal pattern of secretory transformation of the endometrium
it does not inhibit the formation of progesterone
in the human placenta during early pregnancy
it does not cause masculinisation of the female foetus.
...just get regular ultrasound
check ups ...and hopefully u will concieve..
hope u get well soon