spotting every time I workout

Alyssa

so, my SO and I are definitely gym rats. but this month, every time I work out I start lightly bleeding, almost enough to be more than spotting. AF ended on the 20th, and this is extremely unusual for me. Has anyone else experienced this problem? am I possibly putting too much stress on my body? I suffered an intense injury a couple months ago to the abdomen due to a kick from a horse, and I'm also wondering if maybe that's still causing problems.