Breasts have been sore for a while

Hi all - happy new year.
About two weeks ago, I had unprotected sex and out of fear, took Plan B One-Step the next day.
About a week later, I started feeling gassy and bloaty. Then the girls started getting sore. 
I haven't felt any food aversions or cravings whatsoever. I haven't felt any fatigue either - I'm able to run a couple of miles, do some errands and still be able to go out.
Am I panicking? Or am I pregnant? I'm getting a test done this Saturday, and I've already scheduled an OB GYN appointment the following week.