Leg pain from running

So part of my new year resolution was to run more. I’ve been sticking to it 😛. Yesterday i was running on the treadmill and after i got to the mile, my leg started to hurt. My right leg and it hurts around the hip area and from the knee to the ankle. It feels horrible. I’ve been stretching and resting all day yesterday. I’m at work and my leg is in so much pain. People i work with said it’s probably a shin splint. How do i know if it is? All i feel is pain.