Period

I’m 3 days late and I’m having brown discharge. I’m aware that brown is usually old blood, but usually I get my periods on the tuesdays in the morning when I wake up, or Monday nights before bed. And it’s always on the same time so I never worry. But now that I haven’t gotten it and tomorrow will be day 4, I’m really worried. I’m having stomach pains and I have been really hungry lately. Which I do get more hungry on my period but I haven’t even gotten it yet and I’m already craving weird things..