How to TTC stress free?

I feel like ever since dh and I have started trying, sex isn't as fun and obviously isn't as spontaneous. And I know I am overthinking exactly when to have sex to have the best bet but my dh is 46 so everyday for 2 weeks isn't going to happen. Maybe every other or every third but is that enough, or should we save up for the two days I get peak fertility on my opk? TTC is just so stressful and getting AF is so heartbreaking. When I think of the years of worry, trying not to get pregnant and it turns out all I had to do was just try and I would have been safe all along! Any tips for not stressing while ttc?