My oldest did the exact same thing, just before she turned two. Gave her some Tylenol, and she seemed fine, the next morning. No bruising, no swelling. My father (who's had experience with broken bones), said that since there was no bruising or swelling, it was probably just sprained.
After a few days of her saying, "Ow, ow." when she would turn it a certain way, I took her in for an x-ray. It was indeed a buckle fracture, just above her wrist. Though not necessary to set it, they put a cast on it, to prevent her from landing on it wrong, and breaking it all the way through. My personal favorite was all the ugly looks I got, from total strangers.
Just in case, welcome to "The Mother of the Year" club!!! :-)