ovulation spotting / bleeding (5+ days)

Mags • Veteran & military spouse. Obsessed with our dog and our cat is an asshole.
Have you experience ovulation spotting?  If so, what was it like?
Ever since I did acupuncture, I now spot when I workout too hard and spot A LOT when I should be ovulating.
Like, enough that I put my diva cup in to keep from staining things...
Sorry if TMI, but it even has bits of what looks like uterine lining.
Going to the doc in the morning, but I thought I'd see if this was unusual.
My cycle is 28 days in the dot, and to my knowledge I don't have PCOS?