You can’t treat a condition correctly if you don’t have the right diagnosis for that condition. The most common reason for early miscarriage is a chromosomal or genetic defect of the fetus. Both you and your partner can perform genetic examinations because the majority of genetic anomalies are inherited.
Other, less common causes for early miscarriages include: viral infections, irradiation and use of teratogenic medicines during the first trimester of pregnancy.
Rarer causes for early miscarriages include endocrine disorders like polycystic ovaries (PCOS), yellow body failure etc.
You can try getting pregnant whenever you want.