3 weeks post op

[Hair sir]

Hi, I'm currently 22 days post op. Everything was going fine until last night I hit my forehead pretty bad on a cabinet. I don't think it hit the transplanted area. There was no blood or bruising (it's not even red). I'm worried though. Could a blow to the head dislodge grafts at this point? More or less everything I researched said that at 3 weeks, you really can't do anything to dislodge any transplants. Even if I did do this just a few days in, I would know if I lost a transplant because it would bleed. Can anyone tell if this can do any harm?