While Swimming I Forgot To Put My Hand Forward While

While swimming I forgot to put my hand forward while swimming like a dolphin/mermaid in the pool. And then I kind of pretty much hit my head to the rock pretty hard. I think I hit my head around 8pm ish. And then it was hurting for bout couple minutes and just kept swimming. Put around ten pm, my niece went on top of me and pulled my hair. And now it was kind of beating a little. Around 10:30 pm and now it's 10:41. My head hurts right now but not really bad. I am just 16 and bout to turn 17. And my weight is 130 heh just making sure. And I'm not sure if I should be really worried about this. What should I do. And us there sighs I should be concerns if it goes worse and I should be going to the hospital to check up?? Thanks you