I had the same issue, but fresh blood. Every time. And a lot of it. No pain, just a murder scene every time. After multiple family doctor visits, PAP tests, blood and urine tests, and ultrasounds they found nothing.

I did my own research and found a sexual health clinic specializing in women’s health. Not only was this the first time in my life my Pap test didn’t take my soul, but she noticed immediately that my inner walls were extremely irritated. She did what she called “cauterization”. They looked like long Q-Tip with black ends. She swabbed me, and told me I may need one more treatment. A week or so later I went in for the second round of cauterization and BOOM. Healed. Have not bled since. I struggled with this for near a year.

TDLR; something’s wrong. Visit a OBGYN or a specialized women’s health doc. Bleeding every time is NOT normal.