Your complain suggest some UTERINE factor or cause to let you bleed with severe pain in abdomen.
Though UTI cause pain when you pass a renal calculus or concretion with Concentrated urine , it can also make you feel frequent urge for urination, burning sensation on passing urine.
But here pain in abdomen associated bleeding per vaginum also.
Next Steps
1. In your case I need to see ULTRASOUND REPORT.
2. AND URINE EXAMINATION REPORT.
3. Your obstetric history is missing also.
Health Tips
So above information can be more helpful to diagnose your disease properly.
Thank you.