Without knowing the specifics of your injury all I can do is STRONGLY recommend that you see a doctor ASAP. You should not be having continuous bleeding, no matter how slight, after hitting your head.
At a minimum you can have a concussion.
Do not ignore this. You can get MUCH worse.
See a doctor NOW, even urgent care. It can be that serious.
I should add, you may have skull fracture causing this bleeding.
You definitely need to see a doctor.