Blood In Urine

I have a question.......

I had sex with my boyfriend the night before I went to have a physical and they found urine in my blood, I went again for a second time but they didnt ask me to come back. They are now telling me that I have "hematuria" which is urine in my blood. I wanted to know if it could be from having had sex the night before or if it could also be that my period was a week away both times that I went for the urine exam. Please help because I am very worried it could be something worse since I have been reading up about it.