Why arent my tests getting darker?

Question

My period was due yesterday and I've gotten 4 super faint positives 2 were with fmu, is something wrong already???

Answer

Mines never seemed to get really dark either (I used dollar store brand) but I also got the digital one that predicts how far you are,  and that was in track.  Don't know why they didn't get darker (I used like 4 it 5 of them within 3 weeks) but I'm now 24 weeks! Good luck sweety, I'm sure your fine

Answer

I used a food lion brand this time a Walmart cheapie and a clear blue all positive but all so faint you can't even see on the camera. It worries me that my levels aren't doubling or something

Answer

What kind of tests are you using? I used Wondfo cheapies off the internet and the lines never got any darker so I switched to First Response and they got darker every day.

Why arent my tests getting darker?

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