I did a few things, not sure which helped us get a BFP. I took half an aspirin every day a week before O and got a BFP so kept taking it for the first ten weeks. I also took bisolvin cough mixture around O. When it came to BDing, DH and I were doing everything by the book, and it was getting quite robotic and not much fun anymore. The night we conceived, we just let loose and had soooo much fun doing everything we were told not to. It certainly paid off. I also followed some old wives tales, and had yellow booties in our pillow cases and I planted parsley.
Hope some of these things helped.