Increase your intake of vitamin C, especially if you have short cycles.

Glow

A moderate amount of supplemental vitamin C improves hormone levels and increases fertility in women with luteal phase defect.

But don't think that you're limited to just oranges  red bell peppers, strawberries, and kale are all among the top of the list when it comes to being full of this important nutrient, too.

Source: Fertility and Sterility