I am trying to conceive and on 200 mg prometrium (micronized progesterone)..when in the cycle i shd start taking it and when to stop?

After ovulation: If you are ovulating, you don't want to take it until afterwards. Prometrium (micronized progesterone) is not a fertility medication in itself, and if you take it before ovulation, it will disrupt the uterine lining and adversely effect implantation. Take it until you start a period. If you don't start, check with your MD before stopping it.