FRER positive OPK

Okay I felt like I was writing in morse code with that topic line, luckily you ladies know what's up ? haha.  So I took my ovulation test before work this morning as always and there was a much more noticeable line than the past few days.  Anyone use FRER ovulation tests and have input on what a positive looks like?  It's NOT darker than the control.  I wish I would have taken a pic before I left home for reference.  Were bd'ing tonight no matter what, just wondering if I should expect a darker line after work that would be my "true positive?"