Replying to Concussions

So tonight at soccer practice, we were doing head ball drills, and i was going to head the ball but then my goalie comes up and try to head it too, instead of catch it, so he ends up knocking his forehead into the back of my head, and now it really hurts, but my pupils aren't dilated, but I'm moving super slowly, and my reaction to everything is so delayed, so I'm not sure if i have a concussion or not. so my question is, do i have a concussion?