2yrs trying

I have 2 children from previous marriage and in a happy healthy new relationship. My fiancé and I have been ttc for 2yrs and nothing (I'm 29 he is 27).  He doesn't have any children so we both got tested at the gp.  Hormone and spem tests were fine and normal. Even so AF still comes on time each month give or take 3 days so I really do not know what do to now. We have tried everything!! Now we are at the point where we have stopped trying so hard but still each month ends in disappointment.