Nipple bloody discharge?

Hello dear readers,

For two years now, I've had fluid in my left breast, and it leaks from the nipple when I apply slight pressure. I've already been to two doctors and the hospital, and everything seems to be fine. What's been really worrying me is that every few months, blood comes out instead of fluid. I've been checking it regularly since it first appeared, and today I noticed it's bloody again. My breast also hurts; at first, I thought it was due to my period. However, it's now two weeks late (I'm not pregnant).

Maybe they're related? Despite the positive diagnoses, I'm worried because blood isn't normal. Does anyone have experience with this or something similar?

I look forward to your answers.