I read online that Wondfo tests start testing lighter as your hormones get really high. I believe it said this is because the test is only designed to handle a certain amount.  Someone online recommended diluting the pee to get a darker line. The right test is undiluted and the left is diluted with tap water. It is darker! I am really worried because the tests have been getting lighter and my symptoms have been decreasing too. But this gives me hope that everything may be fine. I think I'm starting my 8th week. My first appointment is today!