Help from women with regular periods TTC over a year!

I am curious to know for those women who have regular cycles and ovulate around the same time every month and it took longer than a year to conceive if they know the reason? Was it just luck? Something in their diet? Another issue that was found with testing and fixed?

I feel like after 12 months of trying with no known issues, regular cycles/ovulation, and BD every other day for most of the month it should have happened by now. Any after 12 month success stories would help to :)