Ovulation test

Katie
If you have a positive ovulation test does that mean you will for sure ovulate that month? Since I got Mirena out (March 2014) I have had 5-10 days of spotting mid cycle and have always been worried my hormones are messed up, including ovulation. Doctor says its 'normal' and I get a positive ovulation test every month but just wanted to check with all you ladies :) thanks!