Freezing weather turns test more positive!?!

Kelly
So I peed on a stick and had to go to work 5 minutes away. Took it w me in the car. When I got to work it had a bright blue line! It's currently 16' outside but I warmed up my car. Still when I took the test inside my work it wanted up and was just a faint blue
Line?! Odd huh? Any insight would be appreciated