Concussion Questions?!

On Thursday, I got thrown onto a gym floor and landed on my back and then my head hit the floor with enough force to bounce back up. At first I was pretty fine. My thoughts were just a bit slow when coming to me. I didn't think much of it. And I felt fine today until I went for a walk where I felt a dull pain where I hit my head. Then I felt fine until a few moments ago when i bent down to get something and felt a pressure where I hit my head. Is this blood pooling? I'm downright scared.