I got hit in head yesterday and have a small
I assume it's over 24 hours since the injury. You did not report symptoms that are considered serious after the injury such as headache, vomiting, loss of consciousness or a seizure. All that you have now is a sensation on the bump only when you bend over.
Based on these factors, I don't feel there is anything to be seriously concerned about. You may experience the pressure sensation (over the bump) for a day or two. Icing it and using over the counter antiinflammatory agent (like advil) will fasten recovery.
Hope this helps. Let me know if you need clarifications.