So, each day my period is late...

Glow moves my O days. And really I am starting to get paranoid by it. 'Did I really O on this day?' 'If I O'd later, did I BD at the right time?' 'What dpo am I?' 'Am I testing too soon?' 'What if I O'd earlier when it first thought I did?' 'But then my AF is late...' 'But if it's late, why am I still getting bfns?' --Do any of you ladies have these thoughts? Has this happened to you before bfp? Or maybe bfn...eventually?