That might not help your case, saying it didn't mean anything. Girls often think too much and the next thing you know she's wondering if sex with her meant anything and how much and when and all that.
Anyway, you can't change what you did. Keep yourself busy, try not to be too much of a trollop, and maybe she'll come back to you. In the meantime you may meet someone else in all your busy-ness who seems pretty cool, too.