How Important Is Line Progression?

Hello! So I - probably the same as everyone else- am constantly in fear of having another chemical pregnancy or miscarriage. Is line progression important or am I just being overly cautious? I had my bloods done today (Monday) but don’t get my results back until Thursday! I’m hoping the fact my lines are continuing to get darker is a good thing.

I’m only 4 weeks and Google is definitely no help 😂

( where the dates are doubled up the top one is AM and the bottom is PM )