Has anyone experienced this with their period?

For the past few days I've noticed some changes in my period that are making me concerned. The bleeding has been different from usual, I've had stronger cramps than I normally do, and I just don't feel like myself. I've also been feeling more tired than usual.

I'm not sure if this is something that can happen occasionally or if I should get it checked out. Has anyone experienced something similar? What was the cause, and did it go away on its own or did you see a doctor?