BFP line is getting lighter

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I took a test this morning at 6:30. The line is faint. Much lighter than its beenfor the past few days. I keep telling myself I drank a ton of water and juice before bed, so maybe my urine was just too diluted. I am in tears, though, because I'm terrified. I just had a miscarriage in May, and this would just devastate my us. Is there even any point in ringing my doctor? Probably not. I guess I just wait and hope.