QUestion about OPKS

I'm on cd 7 and found a o detecter lying around. I decided to use it to see what the lines would look like if I'm not oing (last month it seemed like my surge line was equal to or darker then the test line for a few days and the day after I started testing I got a +opk). Anyway, today the surge line was lighter, but still visable. I was wondering if there is ever a time when the surge line is not there????????
Thanks Girls!

Re: QUestion about OPKS

I think most OPKs indicate the there is not a surge yet/or it's over- by a line being slightly faint or not there at all. Either way, if the surge line isn't as dark or darker than the control line- no surge yet...or it' happened already. HTH!