Positive or not on Ovulation Kit

[Char1414]

This is my first time using an ovulation kit. I have an average of a 26 day cycle. I started the ovulation kit on day 12. I tested 3 times on day 12, 3 times on day 13, once on day 14, once on day 15 and once on day 16. It's hard to tell which day I actually had my LH surge because there are a few days where the test line is as dark as the control line. (Please see picture). Anybody have an idea or have experience in this? Thanks!!