Is this normal line progression?

Lorelai
Getting scared of having a chemical
Got first vvvfl bfp 10dpo and a little darker 11 dpo
Today's test (12dpo) only turned this depth of pink after the 3 min mark (at 5-7mins)
I keep getting negatives on clear blue digital tests which is worrying me. Box says can detect 4 days before period due. My period would be due on sat!
Any comments/ advice welcomed!
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