Okay, so I started me period last Sunday and it was 2 days earlier than usual. It seemed like a pretty normal period it was just a little lighter than  usual. It lasted about 5 days but the last 2 days were just spotting. During my period I had severe lower back pain much worse than usual. Now I've been feeling off. I've had nausea, vomiting, diarrhea, heads aches, and a little bit of dizziness along with mildly sore breasts. I know that it's probably unlikely I'm pregnant because I had my period but is there still a possibility? I've just felt so weird the last couple days.