So last week I had very light spotting for 3 days, with sore breasts, metal taste in mouth, back pain and cramping. I thought it was implantation bleeding but from this Monday it has started again. This time it was spotting on Monday, pinkish brown yesterday and today there's a slight flow of red. I am 3 days away from AF, I have no cramps but I don't have sore breasts or any other symptoms that I had last week. I took a pregnancy test last night and it was negative. Anyone gone through anything similar?