Help understand opk

I'm using the simple cheap opk. I understand the line has to be the same or darker than control line to be positive. My first few there was just one line (negative) today I've entered my fertile period and I had another line faint so I understand this is still negative but does it mean I'm close? I'm gonna carry on doing them. Just curious how I had one line now two event though it's negative it's faint and there