I was going back to my "last AF" and it was really weird. It lasted only 3-4 days and it didn't have any weird textures (clums and you know...) I know, TMI but it makes me wonder if that was actually implantation bleeding... If so, then I must be further along than I thought. Also, I remember I didn't start having nausea with my first until I was exactly 8 weeks (I know every pregnancy is different, but it just a thought).