Pregnancy test not getting darker??

F

So I took a test Tuesday night after work, I had been drinking tons of water all day and it was 6 days before my period. So I took it and got in the shower and when I got out there was a definite line. So, I took the digital and it said yes. Then yesterday, I took another one after work to make sure the line was getting darker(again I drank a ton of water) and it looked a little darker but I decided to take one with fmu and non of them a really looks darker than the next. Is this bad? I think I’m about 4 weeks since I have line cycles. We’re going to try and get it confirmed with a blood test tomorrow. Help! The tests are in order from first -last from top to bottom. The digital and the first line test was from Tuesday night, then last night, then from right now.