Ttc after miscarrige and chemical pregnancy

I ve been ttc my 4th child since april,got pregnant and into 6 weeks started bleeding and ended up in natural miscarrige then 6 weeks later i got my period and started ttc in july, on August i got my bfp and 2 days later i started bleeding again and what i think was a chemical, i dont know whats happening and i just want to try again next month but im still so worried about another miscarrige