5 days positive ovulation test

Ke • Fri, Sep 25

I started taking the 1st response ovulation test on the 10th of this month and got all negative till the 21st so I went to the store to get the strips as well and from the 21 to Today they have all been positive. I take two test every other day to be sure that the other Is wrong but they are both positive each time. What does this mean?