What Precautions Needs To Be Taken For Conception After A Miscarriage?

Hi Doctor, i had a misscarriage last year december when i was about 7 weeks pregnant.. i was spotting before that and was on dupasthon tablets as well as had 3 shots of the progestron injections.. it seems that my my progestron was low.. how do i prevent this from happening again? i'm planning to try to conceive again, but am afraid this will re-occur