I had a bit of brown spotting at 5 DPO and thought AF was on her way. Earlier that day I was cramping quite a bit, so I kept running to the bathroom thinking she was here. Lo and behold, at 9 DPO...a positive pregnancy test! I then spotted again at 10 and 11 DPO...nurse told me it was still implanting. Actually ended up spotting on and off through my first trimester - it was an absolute emotional roller coaster!