Okay, so I'm hoping someone can help me out. The first day of my last period was June 27th, 2013. I had sex once, on the 8th. Now today, July 28th, I've had some very mild cramping and brownish red discharge that only shows up when I wipe. I also have tender breasts and fatigue, and over the last week or so I've been a bit nauseous. Can anyone help? Is it possible this is implantation bleeding, and if so when can I test accurately?