OPK on CD 16

 First of all I have to apologize if this blog is TMI all the time, but it's a TTC blog and they tend to be that way.

So.... I just took another OPK, it's CD 16 and it looks like it's a positive... even though the line is thinner it's much darker than the control line. I am putting the CD 15 photo below as well for comparison. Please let me know what you think, I appreciate any input as I am new to the whole OPK use.... it's my first cycle using them.

                                           CD16

                                          CD15