I need your OPK input!!!

Eileen
So these are my tests between CD10-CD14.....
The first 3 were definitely negative but yesterday CD13 I had two test that were pretty dark, just couldn't tell for sure if positive. Now this morning another negative test. Is it possible that I ovulated yesterday? Baby danced CD12 and CD13. Also having cramps on my left side?!?! Any thoughts please!!