What is going on?!

OK guys! AF was due 9/9 and it still hasn't shown up! I have taken numerous pregnancy test and all were a BFN! I've had tender breasts with a little shocking sensation the past week, slight headaches, increased appetite, and cramping. Last night after using the bathroom I wiped and noticed a clear discharge with a thread like streak of blood. I have never seen that! Anybody in the same situation and ended up finding out they were pregnant? I just don't know what it could be!