Red or blue due tests?

My doctor told me that blue due tests were better but a few other people told me red dye were better. I got a very faint positive today tho with blue dye and I'm not due for my period for 2 days. I'm gonna retest but I just wanted some opinions and don't wanna tell anyone if I'm not pregnant. It's hard to see in the picture but it's a bit darker in person.

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