If it's a minor fracture you will feel it tomorrow.
Came off at Inners a couple of years ago, landed on my left knee. Most painful thing ever, had a good long sit and nearly cried. Gradually faded, continued to the end, did the red route at G'tress then drove back to Kirkcaldy. Usual clean bike, make dinner etc before bed. Knee wouldn't bend the next morning, trip to Victoria hospital A+E as a result. Fractured kneecap. It's amazing what a bit of adrenaline can do to keep you going.
Anyway, if the pain is worse rather than better tomorrow, go and get yours looked at. I think you would know if it was broken but could be a minor fracture. Bruised bone possibly, they hurt too.