Going to throw the ovulation tests all away

I am about to throw my whole box of clear blue digital ovulation tests away! I'm so frustrated! Still no smiling face! I have had apart lower left stomach area which makes me think I'm ovulating! But I took a test this morning it said no so I waited till later on today to see and its still saying no! I'm so frustrated! Been testing for 6 days now I have used more then 10 testers due to errors or thinking it was wrong! How much longer should I keep testing! I'm also thinking that getting these have made me stress out more! I'm getting so pissed! I don't understand!