I have had 2 carbon bikes, a few crashes, and never had any problems with either of my bikes. I have nothing against steel bikes (I have one, too), but carbon is not inherently evil, as some would suggest. Not you Catrin! It's just that in 10 years I've heard this same mantra over and over, yet I don't know anyone who has had a carbon bike "fail."
Get it checked out, of course, as I would get any crack checked out, no matter what material my bike was made of.