Depends on what hits. You'll have to look.

Anyway, there are skidplates and braces underneath the engine that protect most components... and even if you scrape your oil pan, nothing bad will usually happen. If you bang it hard enough, the gasket might start leaking, and if you really dent it, it might obstruct the oil pick-up tube, but those things are tough, and it takes a really spectacular whack to do that to an oil pan.

Only other problems from a minor scrape could be if you mess up your exhaust alignment. Everything else delicate (suspension parts) is protected by proximity to the wheels.