I am supposed to get my period in the next 4 days. Yesterday I noticed a very faint pink discharge which then turned into dark brown discharge. I was cramping, but not as much as a period. Today, there was still a little bit of brown discharge and now it looks like lighter blood, but not thick, almost watery and not heavy; usually when my period comes it starts heavy. I took a pregnancy test and it came back negative but I have been nauseous for the past week. Could I be pregnant?