I’m confused

I’m 8 days till Aunt Flo and I have had cramps that started at my left side of my pelvis and is now a dull ache pain in the center pain and the place the dull ache pain is at is now hard. I also had some brown spotting when I went to the bathroom earlier today but it hasn’t happened since. Anyone have any guess on what it could be or should I go see a doctor because of the hard spot in the center of my pelvis?