How many months?

We started trying in June 2007..i was half hearted to start with, but with each passing month, we realized that something just wasn't right, and today, 17 months later and a multitude of tests later, we none the wiser. We are in perfect health, me 29, hubby 28... I make perfect eggs an his swimmers are as healthy as they get.... we had a monitored cycle this month, and it just told us what we already knew, WE ARE FINE!!! so may be its just destiny.