Yesterday I had a brown spot when wiping, and today every time I wipe there is a tint of light light pink. All of this month, I had unprotected sex. Last month my period was normal and on time, but the month before I literally took 15 pregnancy tests, and my period was just late. Trying to avoid that again!! Has anyone ever experienced implantation bleeding? If so, what were the symptoms? How long should is last? I will drive myself crazy until I can test and it be accurate.