Faint Lines not darkening

🌸🌺🌸 • 26, stay at home mother of a wonderful 7 yr old daughter, a magical 5 year old son, a cutie 3 years old son and an adorable 1 year old daughter. ❤️❤️❤️ **Expecting little bean #5 🥰🥰** I'm also a compulsive tester 🙊 Baby dust to all 💗👶
Hi, on the 23rd I got my first vvfl on a test and they got increasingly darker everyday till the 26th, and then I got a negative with a different brand, and an other vvvfl the next day and then a negative. Has anyone ever had non darkening pregnancy tests? Could I still have a normal pregnancy even though my tests don't darken? What are the other options? Miscarriage? Chemical pregnancy? False positives?
I did the blood test yesterday and I am waiting for the results, I just want a clue of what's going on before getting the results.

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