Green tea should be enjoyed as a supplement between AF to O, then stop due to the folic acid issue. If you don't like the taste of it, it is available as a pill "green tea extract." This is what is in the Stanford Fertility Blend. It can also be iced and drank quite liberally. I ice a moroccan mint green tea and it's amazing. Drinking it for the FP should not pose a folic acid issue, but it's not recommended once you are pregnant (or could be). In addition, keep well hydrated in general, helps the overall cm.
HTH!