REALLY WET. PLEASE HELP!

While having sex this weekend I got EXTREMELY wet. I was riding him and literally I was sliding around and it was running down my legs. this has NEVER happen to me, I would actually consider myself to be on the dryer side. After we got done, there was a big wet spot on the bed. I am confused why this randomly happen, ALSO it smelled a little like pee? it even seemed to have stained the sheets a little. I’m so confused? Did I pee? Is this normal?