I've been bleeding on and off for over three weeks, it started two weeks after my period,the blood itself goes from dark/brown to light red in color it doesn't happen every time I use the bathroom either,asking with that I have lower abdominal pain, I got check the week after it started the doctor found blood in my urine and gave me antibiotics for a possible UTI I also had blood test done that included STDs everything came out negative The pain didn't stop I thought maybe yeast infection but no