According to the information you reported (frequent painful urination with burning sensation, which occurred after intercourse, previous repetitive urinary tract infections, blood in the urine), it seems likely that you might be experiencing a urinary tract infection. Whether the bacteria that cause the urinary tract infection are newly transmitted or are old and began to multiply due to changes in the vaginal environment caused by intercourse, cannot be determined for sure.
The bleeding is highly likely to be caused by the bacteria. One of the most common bacteria that cause urinary tract infection called Escherichia coli can attach itself on the urinary tract walls causing damage and subsequent mild bleeding.
You might want to visit your family doctor for a urine culture which would reveal the exact bacteria as well as the most effective antibiotic. Otherwise there is a possibility that the antibiotics you take are ineffective because the bacteria have already developed resistance.
When taking antibiotics sexual abstinence is recommended and testing and treatment of the partner at the same time is recommended in order to prevent repetitive transmission when you cure the infection.
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