Strength of a line

In August I found out I was pregnant three days after my missed period. The lines were very faint, but Clear Blue digital confirmed it. A week later I had a very early MC.

When I was pregnant with my son, I had a dark line a couple days before my missed period.

We are TTC, and I’m 4 days before AF should be here. All of my tests have been negative. I obviously know I’m still early.

My question is: Is there a correlation between when you get a positive/strength of a line to the levels of hormones? I’m worried if I don’t get a strong positive until a few days after AF is due, that if I do find out I’m pregnant, I’ll lose this one too.

Any advice or personal stories are more than welcome 🧡