Question

Mary • 37 yrs old and just gave birth to my rainbow baby 2/22/17 after having had 6 losses and I'm expecting again on 2/9/18
I did an opk tonight and the line looks as dark as the control line, but it may be a hair lighter, its so close i'm squinting to be able to tell! How would you enter it in your Glow data? Would you say - or +? I mean its so close! I've had deff positives the past two days....i just wanna try to enter the most accurate data possible