My AF is a 28 day cycle, I ovulated on the 21st July and had unprotected sex before and after. I started bleeding a brown/maroon colour on the 27th July that then turned into pink discharge and now on the 28th is red like a period. My period isn't due for another week. I tested with a cheapy and it came up negative as I am only 7dpo, but even though the blood is now like a period though not as heavy. Could it be implantation bleeding? Has anyone experienced this because this has never happened before my period has never came a week early ever.