Brief Answer:
Get the investigations done.

Detailed Answer:
Hello, XXXXXXX

The most probable cause of your symptom seems to be due to Urinary tract infection or renal stone.

Along with common causes of hematuria in men and women, usually females see visible bleeding before they take a urine test in the laboratory, but there are some common causes before any diseases could be suspected.

Blood in urine of woman due to dehydration, poor hygiene, or holding urination for long period.

Urine test show only increased count of red blood cells and few to no puss cells unless the condition developed to UTI.

Urinary tract infections are likely common in women due to their shorter pipework than men,

Here are few signs which are usually seen in UTI and kidney stones. Do you have any one of these along with bloody urine.

First usual signs: , bloody dark brownish urine is the first sign usually seen especially morning when peeing in bathroom after wake up. While painful urination in UTI can be seen if infection cause problems in passing urine or ulceration of the infection location.

Increased urinating with little output.

Feeling of urgency to urinate everyday while you may not need to, feeling like you need a wee and when you go only a bit comes out, and pain comes again.
Wake up few times to pass urine

Stingy pain or feeling a burning sensation while urination or all the time.
Suddenly feeling a burning sensation in female’s urethra.

Lower back pain unless it found due to pain in the bones or spine.

Have blood in urine ONLY once in the morning when go to toilet after waking up while rest of the day the urine is clear; I can pass urine smoothly with no pain
Light blood on the tampon or the paper after period bleeding end with painful urination

Foul smell on my discharge recently
The following sexually transmitted disease causing blood in urine.

Chlamydia
Genital Warts
Gonorrhea
Hepatitis B
Herpes
HIV & AIDS
Human Papillomavirus (HPV)
Molluscum Contagiosum
Pelvic Inflammatory Disease (PID)
Pubic Lice (Crabs)
Scabies
Syphilis
Trichomoniasis (Trich)

I suggest you to get urine routine along with culture done.
Get the ultrasound of abdomen and pelvis to rule out the renal stones.

Take care.

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