Dear Tito,
If you have not used a condom during the intercourse, then it is possible that you have contracted an
infection from the foreign flora of the rectum. Blood in the
urine is a serious symptom and it should not be neglected.
What you need to do now is visit your doctor, for him to perform the necessary test and prescribe you the treatment.
When the infection will be determined your doctor will tell you if your partner also needs to be treated, most likely not.
Regards, John.