Bumped my head on 13th day after HT. Would the grafts get damaged within the scalp from the pressure of the impact?

Its been 13 days since my Hair transplant for 1600 grafts. While sleeping in the bus, due to sudden braking, I accidentally bumped my head on the front side (just above the hairline where grafts were inserted) to the seat ahead. I checked with my fingers & there was no bleeding. Just slight pain for couple of hours. I assume grafts are firmly placed after 6/7 days & cannot be dislodged, but is there a possibility of the grafts getting damaged within the scalp from the pressure of the impact ?