I never drank coffee at all when I conceived my boys. I was a daily green and white tea drinker!!!! I'm definitely including caffeine in my sway-- a double shot of espresso a day and a diet soda.
I stopped the diet soda after O since I was drinking it with vodka every day and I'm limiting the espresso during my TWW as well after reading on an IVF site where the doctors said to limit caffeine from all sources during the TWW since it constricts the blood vessels and could lead to early loss.