Stressful

Me and my Fiancé have been trying really hard to have a baby but nothing seems to work out. I have downloaded multiple apps such as glow, eve, and so on to get some assistance with tracking my fertility and periods, I even also stopped worrying about having a baby just because I thought it was stress that was refraining me from having one. My soon to be has also asked friends of his what they did and we have tried everything recommended. I am hoping I can get some awesome advice on what to do.