Did I just get an early positive?

Rose 🌹
I'm 8dpo and just peed on a stick. 
As I was watching the pink dye move up it settled on the test line and there were too distinct lines. By the end of the 3 minutes the dye had settled on the control line only. 
Is this how the tests work or is it possible it picked up on hcg but not enough to show a line?