I'm 21 Years Old, I Was Having Sex With My

I'm 21 years old, i was having sex with my wife, and noticed when i ejaculated there was some blood in it. i looked online and it said that if under 40 it could go away by it self, well a few days later we tried again and there was still some in it. i was just wanting an opinion. it dont hurt when i pee my balls dont hurt their not swollen, no blood in pee.