Heavy period and clotting

Anna • 23 years old, just trying to learn more about my body, my cycle, and how it fits in with sex & pregnancy : )
Sorry if this is tmi! I'm 23, and for the past 5 or so periods my blood flow has gotten very heavy, and I constantly have small to large blood clots. I'm just wondering if this is normal or if I should go to the doctor? Has anyone else experienced something similar?
My periods are regular, and last about 7 days, with only light flow to spotting for the last 3 days. I don't get much cramping, and if it is it's usually minimum. I haven't experienced any light headedness or dizziness like you'd get from blood loss.
Any thoughts would be great, thank you!