What does it mean if your line is fading?

Sl

I got my first positive pregnancy test two weeks ago exactly today.

Immediately so excited, got a blood test that day and another 2 days later everything was great (like HCG doubling and progesterone at 20)

I stopped all the *don’ts* I was doing which were minimal- coffee, sushi and cold baths.. I’ve been testing every single morning since. Idk why I guess I just want to make sure everything is okay and idk if it’s supposed to be this way but my lines aren’t getting darker, if anything they’re lighter. I don’t drink water in the night and I use urine from over night etc so it’s not diluted.

It might not be fading but in my mind it is and I also thought it was supposed to get darker as your HCG gets more abundant and it’s definitely not doing that.

I’m supposed to be 6-8 weeks along. 2 weeks ago my levels were consistent with a pregnancy between 5-6 weeks but we don’t know for sure because I’m so irregular so I’m waiting for my ultrasound but I’m so worried today. Please tell me if this has ever happened to you? Was everything okay?