What causes heavy clear watery non itchy discharge after period. done hvs and was told there was no inflection. could it affect if am ttc?

I can give u an idea: of what causes discharge in general but can't give you a specific diagnosis. Normal hormone changes, vaginitis (including bacterial and trichomonad), chlamydial infections and irritation from tampons etc. can cause a clear watery discharge. Its effect on fertility depends on the cause. Make sure you get checked for chlamydia, gonorrhea and trichomonas before you TTC. Good luck!