TTC after Miscarriage

I Had A Missed Miscarriage At Around 9 Weeks Of Pregnancy. I Want To Start Trying Again. Right Now Baru 20 hari. Is It Safe? No More Bleeding. And Had Started To Ovulate. Cuma Belum Datang New Cycle Of Period. I Don't Feel Like Waiting Till 3 Month. My Hcg Level Is Undetectable Now Bila Tested Pakai Pregnancy Kit. If I try again after my first period cycle would it be okay? Anyone with a successful pregnancy after miscarriage? And can you share how to prepare and prevent from another miscarriage. I have done a lot of research. Some said need to take supplements to increase progesterone. I really hope for a baby soon since I've been married for almost two years already and still with no baby. HELP..