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I need more information: your age& gender, is this one single time or has it happened before, is it frank blood or bloody tinged, do you have any major health issues, any burning when you pee?
Well, the most likely issue here is passing a stone, coming down from any where within the urinary tract. It can also be UTI. It would be best of you get check in a local ER soon, specially if the pain and blood persist. You may still email me with the information above or if you have any questions. Best wishes