I suugest that you get the car inspected on a ramp asap. The damage may be minor and you have simply dislodged someting or it could be much more serious.
In the absence of a ramp, I suggest that you find a steep curb or similar to raise the car sufficiently to crawl underneath making sure that the car is in a safe position away from traffic and with the handbrake on and in first or reverse gear and with the ignition keys removed.
Risking a little dirt on your clothes is a better option that finding that you've dome more damage by igniring the problem.
