I keep ejaculating blood. i've ejaculated a few times in the last few days and its been blood. no pain. just dark red blood instead of semen. why?

Hematospermia: Bloody semen is called hematospermia. The most common cause is trauma to the internal genital organs (prostate, seminal vesicles, etc). Often from activities like horseback riding, off road biking, etc -- but even smooth road biking can do it. If no such possibility and/or if the blood continues, see a doctor, preferably a urologist. Good luck!