Confused.

My period started almost a week before it was supposed to, I had major lower back pain which isn't uncommon but what is, is that it's very light. It started after we had sex and it was sporadic, I was up all night due to the cramping but it wasnt period cramping more like just pressure. It's a light red and kind of pink but not like period blood its just like regular blood like a cut on your arm. It's weird.