I have had on and off pink discharge for six days now. It started six days after ovulation. At one point it was brown and another time it was just thick and white, now it's just light pink CV. My period is due in four days. I only had a tiny bit of cramping yesterday. Today I took a first response test and got a BFN. Does this spotting sound like implantation? I have also had a raised basal temperature and sore breasts for the first time in my life. May just be my cycle playing tricks on me. I know PMS symptoms can change, but normally I have cramps. I'm also on antibiotics so I don't know whether that affects the menstrual cycle...