They say when u dnt obssess about it u get your bfp?!

So i heard alot of stories of women who gave up or just didnt think about ttc and fell preg but how can this be for someone who can be irregular? I can get my af as early as 25 and as late as 38 , my ovulation day always changes and me and my husband isnt the type to have frequent sex so how may this be? does tracking really puts u in stress or in obbsession??