doctor's urine test came back faint positive

Gage
I've taken 6 first responses since my faint BFP at 12 DPO. They have all gotten progressively darker with the last one at 16 DPO with a solid second line. 
I just went to my doctor appointment for bloodwork and they did a urine test first. They said the urine test came back with a faint positive. 
Should I be worried that it was faint? The nurses asked how early I am and said that usually the lines show up really dark.