Worth going to the doctor?

River

My periods are almost always a month apart. I just recently started my period 9 days early, and it’s a lot heavier than normal, with really bad cramps. I’m also experiencing more fatigue than normal. I’d hate to go to the doctor and it be nothing. Is this normal? Or should I see a doctor? If I should see one, should it be my primary care doctor or my Ob-Gyn? Thanks in advance.