spotting, dr, faint line?

Lyn ☀️ • Step Momma to two amazing guys- 19 & 17. expecting march 2019.

Hey all! I had a great big positive on Sunday and my line has progressively been getting darker since then. I have been spotting and since last month I had a chemical pregnancy I called my doctor. They just had me come in for blood work. They had me do a urine test 1st and the nurse said it was barely a faint line. They still did the blood work, but is it normal for them to barely get a faint line on their test when I got a great big positive this morning on 1st response? Do you guys think I'm having another chemical?