Thanks for posting on HCM,
I think you should follow your doctor's prescription by taking ecospirin for 3 months. The major cause of miscarriages are chromosomal abnormalities which are most often detected only after analysis of the the products of conception. If infections and immunological causes were ruled out then it is likely that chromosomal abnormalities are the cause. Stress
imbalance, and other causes are rare.
They are not much precautions to be taken for next conception only that you should keep a good sexual habit, get screened for STDs and other systemic infections, get a pelvic scan for abnormalities that could predispose to miscarriage and follow your doctor's/gynobs' instructions.
Hope this helps