Is it a concussion?

Around an hour and a half ago I fell from approximately half a meter high and landed on my right side. I bumped my head onto the pavement, but it wasn't that hard (it was actually the thing that hurt the least). But right now I have a small headache and when I turn my head in any direction (not even that fast, but at a normal speed) I start feeling slightly dizzy. Is this a concussion or is it just the shock? I read online (however I don't believe it that much) that the headache could actually just be from the fact that the rest of my body is in pain?
Is it a concussion?
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