Help! My 1st time using opk's started testing 5days before expected O, and the darkest line is what I got today, is that…

Help! My 1st time using opk's started testing 5days before expected O, and the darkest line is what I got today, is that line dark enough for a positive opk? When I look at it it is just as dark as the control line maybe a bit darker but I'm not sure