TTC how what why when ?

Me and my fiancé have been togther for a little over 5 years and I still have not gotten pregnant.! I have not taken birth control. Neither of us have the funds to go to the doctor. I downloaded this app to keep up with cycles and fertility. Is there anything else we could do that's inexpensive?? I believe it happens when it's supposed to happen as well, but I just can't help but want a child of my own. Something to keep me going everyday. Help please lol !?!?