Tests aren't getting darker?

I got my first positive 5 days before af because my husband insisted I needed to take a test. I took the test around 7pm and it was definitely positive. I took another test the next morning with fmu to be double sure and it was fairly faint initially (maybe because I drink a lot of water?)

I waited two days to take another test (today) and it doesn't seem to be getting any darker. It was technically my second pee of the day and once again I drank plenty of water last night.

Af is technically still two days away so maybe I'm testing too early? I'm so scared or another miscarriage 😥