Did I sprain my ankle or pull a muscle?

So today I just went boating with my boyfriends family. Before we decided to go wakeboarding, me and my boyfriend decided to be pulled by the boat in tube like thing. Except, there's a bottom in the tube. Anyways, while he dad was driving the boat, he sped up and drove over a wave. The collision impact immensely hurt my ankle, and we had to stop. Now I wonder if i have merely a pulled muscle, or sprained ankle. I do not have any bruises, but it hurts to bend my foot in any direction. It does hurt to walk, but i CAN walk. It's not an unbearable pain, but it does really hurt. I can't really notice swelling, but there might be. What do you think i have?