Should I Start Letrozole Again And Take HCG Or Duphaston To Support Pregnancy After A Miscarried After Conceiving With Letrozole?

Hi, I have pcos and irregular periods. I was prescribed with letrozole and had first cycle of letrozole in the first week of April. I conceived but ended in miscarriage on May 11. Now it’s 3 months over. I would like to try for baby. Should I start letrozole again, if so should I take hcg inj or duphaston to maintain the pregnancy.