Shouldn’t they be darker?

Nicole👼🏻👧🏻👦🏼👼🏻👼🏻👼🏻👼🏻👼🏻

According to my app, I should be 4 weeks and 3 days pregnant (19 DPO). Because I am addicted to testing and I’m paranoid about a miscarriage....I tested today (for like the 20th time since confirmation) and now I’m worried because I feel like the lines should be so much darker. Is this normal?