TTC for #3

I just joined Glow today because I'm looking for some positive feedback and support. My husband and I are 33 turning 34 and are trying for # 3. We are on cycle 4 of trying and no luck . I'm feeling anxious and stressed because every month is just a let down with the negative pregnancy test . We had a miscarriage in January of this year I was 9weeks and it was devastating. Wondering is there anything to do naturally to increase fertility ?