Opk dried negative?

So I took an opk tonight, and thought it was positive, with the test line being darker than the control. I took the test downstairs with me so I could take a pic of it, but then got 'busy' 😂😂😂. After when I was going to bed, I looked at the opk and the test line had almost completely vanished! Now I'm questioning if maybe I had the test upside down when I first read it. I feel crazy! Anyone have some insight? Here is a picture of the test when I looked after bding.