A concussion or head bump is not a reason to be seriously concerned about a brain bleed.

Here is a quote from Brainline.org :
After a concussion, the chances of this happening are not large — about 1 in 1000 — but the only way to diagnose it is with that hospital-based CAT scan.

Here are the symptoms of a concussion that should prompt an immediate trip to the hospital or emergency department.

Loss of consciousness, even if only briefly
Any period of amnesia, or loss of memory for the event
Feeling dazed or confused
Headache
Vomiting
Seizure

I think the 1 in 1000 is overstated. It is more likely 1 in 1000 concussed patients who show up at the ER. Very few concussions result in a trip to the ER.

I prefer to not be exposed to the massive radiation dose of a CT Scan.

If the symptoms are mild, I don't get concerned. Head aches are normal after a head bump. Severe head aches may justify an ER visit or Urgent Care visit.