Ovulating twice?!

I'm confused and wondering if this has happened to anyone else. Saturday CD11 tested no LH surge, Sunday CD12 no LH surge, Monday CD13 faint line, Tuesday CD14 dark line, Wed CD15 dark line, assumed I was ovulating from positive tests, felt like I was ovulating. I keep testing just to confirm and make sure the line gets faint or there is no line. Thurs CD16 faint faint line, Friday CD17 no line. Saturday today CD18 symptoms of ovulating again tested and dark dark LH surge line right away?! Confused? Could I test positive twice in one cycle? I have sharp pains in my side today more than usually when I'm ovulating. My husband and I are trying regardless of ovulating or not so I know we are covered, but it's really confusing! All tests are from the same box.