Is this normal?

Okay so first pic is first test I took 6 days ago, second test was 5 days ago, Third pic was last night and last pic was this morning. Does it look like my tests are getting darker? Does it look like my HCG isn’t rising quick enough? I have no idea when my last period was as I wasn’t actively TTC and so I have no idea when I ovulated I just on a whim decided to take a test and sure enough it was positive!!! Any advice pleaseee.