Hi I Am First Time Pregnant WITH The Help Of

Hi I am first time pregnant WITH the help of IVF, My specialist rxd me Duphaston 10mg TDS and Gestone 400mg vaginal pessary OD with ESTRADIOL 2MG BD. my worries is I can't get Duphaston easily, can I use Duphaston 10 MG twice instead of Thrice and GESTONE 40OMG TWICE from once. Keeping the estradiol same