Odd tissue discharge- what could it be?

Hello! To preface this I am 18, I don’t menstruate and have had Nexplanon for a year which is how long I haven’t had periods. I had UTI symptoms, got Bactrim for it, and on the fifth day of treatment started bleeding and having clots. ER said I had passed kidney stones and the blood was from my urethra but I seriously doubt I peed this out. Any ideas?

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