Can you describe the bleeding.
Was the blood mixed in the semen or did you notice it
after ejaculation.
Was there any blood mixed in the urine after peeing
and any sting in the head after you peed.
Most guys will bleed sometime in their life from sexual
activity but usually only about 4-5 times in their life.
Anal is usually harder on the penis and you may have caused a tare forcing the pee hole open when thrusting.