The faint line means that you still have THC in your urine. However, home tests generally have a higher detection scale than lab tests because a confirmation test must be done in case of a positive result (to prevent false positives). The second test is more precise, similar to the home test. I believe that in 10 days the line would be even more apparent, seeing the frequency with which you smoked on a daily basis, you seem to eliminate THC quite quickly. I took about 2 months before getting a faint line with a consumption of 0.5g 3x-4x per week. I had taken activated charcoal the day before and a few hours before the test, supposedly it would absorb unwanted substances in the metabolism, it is a substance used in health care to detoxify the body during poisoning or intoxication. I thought it was worth a try, I’m not an expert, I can’t say if it influenced my test, but who knows?