HCG Levels...

I was 4 days late when I found out I was pregnant which meant I only got a very faint positive on both a FREE and a cheapy test. This was on Wednesday, 4 days ago. on Friday I got a negative for a clear blue. however 1 day later, on Saturday I got my 1-2 weeks pregnant with FMU. Fantastic I thought. However, I have tested today with a cheapie and got a positive but the second line is not as dark as I thought it would be. Below are my tests. starting with the first one.

Advice anyone.. am i over thinking lol 😂😂