Is It Safe To Take Duphaston To Induce Periods?

Hello, I am taking 1 tab Duphaston 10mg twice a day to induce period after my lining failed to reach more than 6mm for an embryo transfer (i was on pills and estradiol patches). Today is the 5th day I am taking the tablets and no sign of period. I have a total of ten days worth of tablets. When will I get my period? After the full treatment os over? I seem to remember my gynae telling me I wld get it within 3 to 5 days but so far nothing. Thank you for your kind help