I, too, thought I might be pregnant this month, but then arrived a heavier bleeding than I thought would be implantation bleeding - two full days of bleeding plus a couple days of spotting, which was heavier than implantation bleeding I noticed during my first pregnancy, but much lighter than my regular period. After googling this unusual bleeding + post conception, I found this thread and immediately took a pregnancy test based on others who had this same strange short "period" only to find out they were pregnant. I am, too! Thanks for this info - maybe someone else out there will benefit from reading these accounts of an unusual pregnancy symptom.