OPK results help - please!

Hoping I can pick your brains!I have been testing consistently twice a day for the past 2 days with smu & 6pm pee. Usually I have the faint no surge line, and this morning I got a darker line, but I can't tell if it's as dark as the control, this picture is on the left.I took another test tonight, and got the faint no surge. This picture is on the right for comparison.What are yours thoughts?CD12, 28 day cycle. Link to my chart: http://www.fertilityfriend.com/home/6197ae