As soon as I took the test I saw the line appear and watched for about one minute. I figured it would get darker so I walked away for 3 minutes and timed it to make sure I didn't wait any longer. I ran back to look at it and now it's extremely hard to see the line?! It was super easy to see earlier! Has this happened to anyone else??

Does it still look like a faint line? I'm so confused! Why would this happen? False positive maybe?