Not sure how tough your boat is but, we had hit a few rocks and things in our old Bombay before we sold her, Solid rock was one of them that brought the boat to an instant stop from about 6 knots, and we didnt have a scratch. I doubt you did damage. If the boat stopped then rose it means you hit and went up on it. prob a tree or vw beetle or ?
Grab a scuba mask and a dive light if you need it and check your bottom.