Google gluten and fertility. There is a link between cutting out gluten and increased fertility. I've had two girlfriends who cut out gluten from their diets while TTC and it did wonders for them. They both now have babies.
Even for my DH and I, we tried to get pregnant when first married and we just got nowhere. Then 2+ years ago DH cut out gluten from his diet as he was told he had an intolerance. After a year of his being gluten free, and me eating less of it because of our shared meals, I got pregnant. That first pregnancy ended in miscarriage but the second one stuck and we have a beautiful healthy baby boy who's now almost 8 months old.