Charlie what brand of test? Some tests are just late at showing a line depending on how much dye is on the test. I had a test done with Ethan (m/c @ 7wks) and the test was a clear negative yet half an hour later when I pulled it out of the envelope to show my SIL how negative it was there was a blaring pink line. I called my Dr who sent me straight off for a beta and it came back at 150! so some tests are just late to show a line.
I've had tests where you can see a line when it is wet and as the pee goes over the line yet once dry there is nothing there. I trust FRER though more so than any other brand.
hugs, hope and luck for tomorrow hun