Thoughts?

So last week I had my 'period' two days early...it started as pink discharge, got heavy for two days, stopped altogether. Then had 3 days of brown discharge. I felt sick with sore boobs before, during and after. Had a neg pg test before, then after I got a faint positive. Then a negative the next day. So I'm thinking chemical pregnancy, or is it possible I could be pregnant? Or was it a weird period? Arrgh..so confused! ☺