
Had Terrible Stomach And Pelvic Pain. Have Blood In Urine. On Antibiotics. Reason For This Pain?

The symptoms you presented with permit the diagnosis of a urinary tract on purely clinical grounds. This would probably be a bladder infection (cystitis). Presence of leucocytes and lack of nitrites with dipstick were not in favour of a urinary tract too. Also, negative culture results could also be an indication of absence of urinary tract infection.
It would be worth knowing whether other signs and symptoms such as difficulties to hold urine, pain on urination were present or not. Its however, not possible to completely exclude a bacterial infection because, the causing bacteria could be slow growing bacteria of the HACEK group, the manner of collection and carrying of the procedure.
Other causes of blood in urine in this case would be very unlikely. When was your last menstrual period or were you on menses within th period you started experiencing these pains? If its the case, blood seen could be some false positive of blood coming from cervix or uterus but misinterpreted as coming from bladder. However, this is a rare condition but which must also be carefully considered. For during period, collection of urine samples especially should be done very skillfully, after careful cleaning of the vulva and pure collection of midstream urine.
If you were not on your period, clinical amelioration on the drugs prescribed by the physician could still be an indication of a urinary tract infection. I suggest you continue with the treatment regimen prescribed by your doctor and drink much fluids. Report any unusual symptoms if you notice any, and a clinical reevaluation at the end of the treatment could be very appropriate.
Thanks and hope this helps,
Wishing you good health,
Luchuo, MD.

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