Spotting mean I'm pregnant?

My next period is in about a week and a half. But yesterday, I went to the bathroom and saw spotting in the toilet paper, it was light pink. About an hour later I was still spotting. But then I was fine after that. I have no pain but feel super bloated & my back hurts. I'm nausea a lot but no vomiting. I then took a pregnancy test but it came back negative. could I be pregnant ?