Had period then rough sex. peed blood then brown. went away for a few days. constant urge to pee in morning(peed blood) later that day peed red/brown?

Possible UTI: Your symptoms are consistent with a "hemorrhagic cystitis" which is the medical term used for a bladder infection (UTI) associated with visible blood along with the other typical UTI symptoms: urinary urgency, frequency, voiding small amounts, discomfort or burning with urination. Recommend you contact your md for a urinalysis and possible urine culture and/or an antibiotic prescription.