What Should I Take To Get Pregnant After A D&C Showing Genetic Issues And Treatment With Letrozole And Susten?

I am having 8 yr old son i had 2 miscarriages dr adviced to do dnc after dnc the reports mentoined genetic problem miscarriage was no fetal heartbeat i had taken letrizole and susten sr 200 but still not getting pregnant which tablet should i take to get pregnanr my age is 34.plz reply.