Progressing pregnancy tests

Courtney

I got my first definitive positive with a blue dye test on 7/21. I took my first (positive) pink dye test on Friday 7/23. I just took another FR test tonight 7/25 and the line hasn’t even gotten any darker. I mean it’s there definitely but it’s not dark like I see others get. According to my tracker I was supposed to get my period 4 days ago and am 17dpo. Is this normal?