I'd go to the E.R. if you're sure it's coming from your urinary system and not reproductive, it could be a UTI or a Kidney infection.

If you hqve blood in your urine, you may very well have a urinary tract infection. Please go to the doctor.

Yes, it was endo in my case. It had eaten through my bladder & ureters. Don't think the worst though. Many women with endo also have problems with interstitual cystitis. It may just be an infection that antibiotics can cure. A kidney stone would be extremely painful. Also, sometimes it's hard to tell if the blood is coming from your urethra d/t it being so close to your vagina, especially if you're on your period. These are just some thoughts. Please get checked out.

Hoping for the best! Good luck!

I hope you get some pain relief and answers soon!