OPK help PLEASE

Megan
Okay so I'm no pro at these opk's but my SO and I have been TTC for almost two years now so we are giving these a shot. All I really know about these is when the test line is as dark as the control line, it's baby dance time.. right? The first picture is from yesterday, the second one is from today... why would the line start to get lighter before I ovulate? Or was my day yesterday? Or did I not ovulate at all? Help..?