Peeing blood, no pain no kidney stones, went to hospital nothing?

Im 25 female, last night at night I passed a blood clot (no pain, no uti symptoms) after that It was bright red blood coming out where the pee comes out. When I dab paper over the urine tract it leaves a bright red stain so its actively bleeding for 16 hours now. I went to emerge Did ultra sound, urine test and blood work. Everything was clear other than urine showing elevated white blood cells. Has anyone experienced something like this? What could it be?
Peeing blood, no pain no kidney stones, went to hospital nothing?
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