Trying to conceive: is there a special diet to make me more fertile?

Maybe. There is a book called "the fertility diet" by chavarro et. Al. These harvard researchers show that a healthy diet may be associated with higher fertility. The fertility diet is mostly a low glycemic index diet - healthy complex carbs like whole wheat, brown rice, fruits and veggies, avoiding processed sugars, white rice, white pasta etc.
Basically, no. Basically, no. It's not that diet doesn't matter, just there is no 'fertility diet.' healthy balanced eating, limited caffeine & alcohol, no tobacco, moderate exercise, good sleep and staying healthy all support natural fertility. The latest internet drugs-w/o-prescription, herbs, otc drugs, diets, vitamins, teas and supplements to 'make you fertile' don't work and can be dangerous.