I Hit My Head Pretty Hard Yesterday On A Sharp

I hit my head pretty hard yesterday on a sharp corner of a cupboard that I had to sit down for a few minutes. It's now got a lump in a bruised and it's where my parietal ridge is. I don't feel dizzy it just hurts as you might expect. There was a big lump right away but the bruise came when I woke up this morning and it's sore even when I don't touch it. My question is do I have anything to worry about?
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Shelley