Advice please

Angela
So iv been ttc for about. 2 months. And something happened that has never happen before. Af is due Nov 28 (today) but the day before yesterday. I spotted. Like a pinkish/brownish. My breasts are super sore and im getting some cramps. But my back is killin me. So i tested yesterday. With a blue dye test and said negative. Any advice. On what it could be ?