Clearblue advanced digital..

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Hi all, this is my first month using the clearblue advanced digital tests, and I've just got my first flashing smiley today. I'm wondering, do any of you pay attention to what the lines on the stick actually look like? Because mine doesn't look any darker today but I suddenly got flashing smiley, but there is a little bit of a dye run so could that have affected results? thanks! x