unfortunately I would say this is a chemical, my doctor only did a urine test to confirm I was actually pregnant (I was bleeding during this moment) & referred me to get a transvaginal ultrasound a week later to ensure my body did not retain any of the pregnancy.
Unfortunately it sounds like it, even faint lines are positive . I would call your dr just to see what they want you to do. When I had mine they just asked me some questions to see if I needed to be seen but I was so early and went through it at home on my own . Do you have any pictures of the line tests?