Am in the 2WW and Yesterday my BBT fell right down below the cover line. I thought it was game over and hello Period (also got a BFN), was so disappointed. Then today my temp is right back up again! Apparently sometimes temp drops when implantation occurs?! So now I don't know...should I test again today? Also have mild cramps which I don't usually get until first day of AF - which isn't due til Thursday!