Kidneys or period? Involving fourwheeler accident?

Okay well my last period was June 8. Then on June 26 i flew off my fourwheeler and hurt my back (I landed on it and knocked the wind out of me). Well like monday my i got very bad headaches and my mom said i might have got a slight concusion and when it happened my grandma told me to watch for bleeding when i pee and then june 30 i started bleeding and i thought it was my period but now im not sure becuz i quit bleedin the day after so i was wondering if it was my period or what my grandma thought about me injuring my kidneys?? please help