It's rather unlikely that the fork hit anything if you just "fell". If the bike falls on a substantially flat surface, its next to impossible for the fork blades to suffer an impact. This is probably why you don't see any marks.
Is the fork "full carbon" or does it have a metal steer tube? If your handlebars suffered obvious serious impact, there is the possibility that the steerer was over stressed at the stem-headtube area. If it's a carbon steer tube, this is obviously not good!
It is quite likely that your fork is undamaged, but I would recommend that you inspect it, or have a reputable shop check it out and explain the circumstances to them.
Good luck,
Ed
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