I said this to someone else yesterday, and my advice would be the same to you too! Just keep trying and relax - as difficult as it sounds, try not to overthink about TTC and worrying - sometimes stress can have an adverse effect. I'd recommend trying an ovulation kit as the apps I have used to predict my own ovulation have ended up being always off to date so at least that way you'll know where best to concentrate your efforts! Good luck and sending positive vibes to you!