Advice please? Does the line go away as you near AF?

Shannon
So according to glow and my cm I think I ovulated the 6th or 7th. On Wednesday The 9th I got some dollar tree opks and decided to test to just see... It was dark but not quite the same, the 10th was definately lighter, then today it was lighter at first but at around 5-10 minutes got really dark... Maybe the same as Wednesday's??? Shouldn't they keep lightening until obviously lighter or not there? Not sure how that works. AF due the 19th? I'm feeling very subtle cramps but off and on? Any advice? Thanks ladies! Ignore the date the 2 middle were same day Thursday 10th.
Wed 9th
Thurs 10th
Today- this was at 3minutes. Should I have waited a few more minutes?
Top is today, middle 2 are the 10th, bottom is the 9th.