Bbt dip 5dpo

Last night and this morning I had some cramping and pulling feeling that lasted maybe 20 minutes each time and has since went away. I am 5dpo today. And I know most say you don’t get implantation that early but girl my last two babies I had positive tests a 7dpo.

Anyway I know I have not been charting enough. But why did my bbt drop low this morning during my cramps. Could it have been maybe implantation again? I’m hopeful.