No symptoms and faint line

I tested at 5 weeks and both lines were really dark. I did multiple tests and it was obvious that there were two link lines. I am now 6 weeks, 5 days and the line has gotten alot lighter, there are still two pink lines however. I have been and got bloods done at the doctors which has also confirmed my pregnancy. Does the line getting lighter mean anything? I also have no symptoms of being pregnant.