help!

I am 19, and I've been with my boyfriend for almost 4 years. Two days ago I woke up to a weird feeling in my lower abdomen but I didn't think anything of it until today, I am currently 7dpo and I started cramping a little bit ago on my left side. (Sorry for tmi) but normally when I start my period I can feel it, so I go to the bathroom and get a tampon. But I went to the bathroom to pee, not feeling any difference, and when I wiped I had alittle bit of orange/brown blood, not heavy at all. And it's only when I wipe. I'm not supposed to start my period until January 5th and I normally ALWAYS start on the EXACT date I'm supposed too. Any ideas?