Can grafts be displaced or dislodged, although they look normal and well stuck in the scalp?

I had hair transplant with a combination of HUT and HUE techniques 3 days back. I had a tight dressing on my head after surgery, which was removed 24 hours after surgery. Everything was normal except that I had banged my head sitting in car a few times while going home and jerked off after 6 hours of surgery unaware of the consequences.

The hairs look well stuck in the scalp but is it possible that they may be misplaced from their original position and are lying at the skin border and may fall off.

I have seen a few grafts dislodged while cleaning my head, but that no. could hardly cross 5.