Does the line get darker with a chemical?


Hi I'm having what I believe to a chemical miscarriage. I had some faint positives but they was getting darker. I started bleeding heavy 2 days ago. Now it's slowed down to a light period amount for me. I took another test just to see if there was a big change like my last miscarriages was. To my surprise the line was darker. Is this normal or should I get checked out? Any success stories about bleeding heavy and still being pregnant? I was 4 weeks exactly when I started bleeding. Here's my 2 test from day i started bleeding to today.

Top 2 are start of bleeding bottom 2 are today's